FRANK Solutions for Class 10 Chemistry Chapter 11 - F - Carboxylic Acid

Chapter 11F - Carboxylic acid Exercise 290

Question 1

Solution 1

Question 2

Solution 2

Question 3

Write three physical properties of acetic acid.

Solution 3

Question 4

Solution 4

Question 5

Solution 5

Question 6

What is the result of oxidation of ethyl alcohol?

Solution 6

Question 7

Solution 7

Question 8

Solution 8

Question 9

Solution 9

Question 10

Solution 10

Question 11

Solution 11

Question 12

Fill in the blank with appropriate word/words.

(i) Vinegar is a solution of about ________per cent ________in water.

(ii) The general formula for alkene and alkyne are _____ and______respectively

(iii) The catalyst used for hydrogen of vegetable oil is ___________

(iv) For artificial ripening of fruits _________is used

(v) Bayer's reagent is _________

(vi) Esterification is the reaction between carboxylic acid and ______ in presence of ____

(vii) Denatured alcohol is a mixture of _____ and _______

(viii) For test of unsaturation _____is used

(ix) In laboratory ethyne is prepared by the reaction of water an _________

(x) Two isomers of the compound having molecular formula C3H6O are __________and ________

Solution 12

(i) Vinegar is a solution of about 4 to 6 per cent acetic acid in water.

(ii) The general formula for alkene and alkyne are C_nH_2n and C_nH_2n-2,respectively.

(iii) The catalyst used for hydrogen of vegetable oil is nickel.

(iv) For artificial ripening of fruits, ethylene is used.

(v) Bayer's reagent is alkaline KMnO₄.

(vi) Esterification is the reaction between carboxylic acid and alcohol in the presence of conc. H₂SO₄.

(vii) Denatured alcohol is a mixture of ethyl alcohol and methanol.

(viii) For test of unsaturation, bromine water is used.

(ix) In the laboratory, ethyne is prepared by the reaction of water and calcium carbide.

(x) Two isomers of the compound having molecular formula C₃H₆O are propanal and propanol.

Question 13

(i) Compounds having the same molecular formula but different properties are called

(a) Isotopes

(b) Isomers

(c) Isobars

(d) Allotrops 

(ii) The first organic compound prepared by Wohler in the laboratory was

(i) acetic acid

(ii) methane

(iii) Acetylene

(iv) Urea

(iii) Soda-lime is a mixture of

(a) NaOH + CaCl₂

(b) NaOH + CaCO₃

(c) NaOH + CaO

(d) NaOH + Al₂O₃

(iv) When sodium propionate is heated with soda-lime, the product formed is

(a) Methane

(b) Ethane

(c) Ethene 

(d) Ethyne 

(v) LPG contains

(a) Methane

(b) Ethane

(c) Butane

(d) None of these

(vi) Methane reacts with energy of chlorine in diffused sunlight to give the final product as

(a) Chloroform

(b) Carbon tetrachloride

(c) Methylene chloride

(d) Methyl chloride

(vii) Ethene reacts with 1% cold alkaline KMnO₄ to give

(a) Oxalic acid

(b) Ethyl alcohol

(c) Acetaldehyde

(d) Ethylene glycol

(viii) When ethanol is heated with conc. H₂SO₄ at 170^oC, it gets converted into ethane. In this reaction conc. H₂SO₄ acts as

(a) Oxidizing agent

(b) Catalyst

(c) Dehydrating agent

(d) Reducing agent

Solution 13

(i) Isomers

(ii) Urea

(iii) NaOH + CaO

(iv) Ethane

(v) Butane

(vi) Carbon tetrachloride

(vii) Ethylene glycol

(viii) Dehydrating agent

Chapter 11F - Carboxylic acid Exercise 291

Question 1

Solution 1

Question 2

Solution 2

Question 3

Solution 3

Question 4

Solution 4

Question 5

Solution 5

Question 6

Solution 6

Question 7

Solution 7

Chapter 11F - Carboxylic acid Exercise 292

Question 1

Solution 1

Question 2

Write down the equation for the preparation of ethyne from calcium carbide?

Solution 2

Question 3

Solution 3

Question 4

Solution 4

Question 5

Solution 5

Question 6

Solution 6

Question 7

Solution 7

Chapter 11F - Carboxylic acid Exercise 293

Question 1

Solution 1

Question 2

Solution 2

Question 3

Solution 3

Question 4

Solution 4

Question 5

Solution 5

Question 6

Solution 6

Question 7

Solution 7

Chapter 11F - Carboxylic acid Exercise 294

Question 1

Solution 1

Question 2

Solution 2

Chapter 11F - Carboxylic acid Exercise 295

Question 1

Solution 1

Question 2

Solution 2

Question 3

Solution 3

Question 4

Solution 4

Question 5

Solution 5

Question 6

Solution 6

Question 7

Solution 7

Chapter 11F - Carboxylic acid Exercise 296

Question 1

Solution 1

Question 2

Solution 2

Question 3

Select the correct answer from the choices a, b, c and d which are given.

(i) An organic compound undergoes addition reactions and gives a red colour precipitate with ammonial cuprous chloride. Therefore, the organic compound could be:

(a) Ethane

(b) Ethene 

(c) Ethyne 

(d) Ethanol

(ii) The organic compound mixed with ethanol to make it spurious is :

(a) Methanol

(b) Methanoic acid

(c) Methanal 

(d) Ethanoic acid

Solution 3

(i) (c) Ethyne 

(ii) (a) Methanol 

Question 4

Draw the structural formula for each of the following:

(a) Ethanoic acid

(b) But-2-yne

Solution 4

(a)  

 

(b)  

 

Question 5

Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH₂Br - CH₂Br.

 

(i) Draw the structural formula of A.

(ii) What type of reaction has A undergone?

(iii) What is your observation

(iv) Name (not formula) the compound formed when steam reacts with A in the presence of phosphoric acid.

(v) What the procedure for converting the product of (b) (IV) back to A?

Solution 5

(i) H₂C=CH₂

(ii) Addition reaction

(iii) Bromine solution gets decolourised.

(iv) Ethanol

(v) By heating it (ethanol) with concentrated sulphuric acid at 170^oC.

Question 6

Give reason as to why :

(i) Almost 90% of all known compounds are organic in nature

(ii) It is dangerous to burn methane in an insufficient supply of air.

Solution 6

(i) Carbon can form a large number of compounds because of tetravalency and catenation.

(ii) In insufficient supply of air, methane burns to produce carbon monoxide which is a toxic gas. 

Question 7

Choose the correct answer from the options given below :

(i) The number of C-H bonds in ethane molecule are :

(a) Four

(b) Six

(c) Eight

(d) Ten

(ii) The functional group present in acetic acid is :

(a) Ketonic (C = 0)

(b) Hydroxyl (- OH)

(c) Aldehydic (- CHO)

(d) Carboxyl (-COOH)

(iii) The unsaturated hydrocarbons undergo:

(a) A substitution reaction

(b) An oxidation reaction

(c) An addition reaction

(d) None of the above

Solution 7

(i) (b) Six

(ii) (d) Carboxyl (-COOH)

(iii) (c) An addition reaction 

Question 8

Choose the correct word/phrase from within the brackets to complete the following sentences :

(i) The catalyst used for conversion of ethane to ethane is commonly ________ {nickel/iron/cobalt)

(ii) When acetaldehyde us oxidized with acidified potassium dichromate, it forms _________ (ester/ethanol/acetic acid)

(iii) Ethanoic acid reacts with ethanol in presence of concentrated H₂SO4 so as to form a compound and water. The chemical reaction which takes place is called ______ (dehydration/hydrogenation/esterification)

(iv) Write the equation for the reaction taking place between 1, 2-dibromoethane and alcoholic potassium hydroxide.

(v) The product formed when ethane gas reacts with water in the presence of sulphuric acid is __________ (ethanal/ethanol/ethanoic acid)

Solution 8

(i) Nickel

(ii) Acetic acid

(iii) Esterification 

(iv) 

(v) Ethanol

Chapter 11F - Carboxylic acid Exercise 297

Question 1

Write balanced chemical equation for the following :

(i) Monochloroethane is hydrolysed with aqueous KOH

(ii) A mixture of sodalime and sodium acetate is heated

(iii) Ethanol under high pressure and low temperature is treated with acidified potassium dichoromate

(iv) Water is added to calcium carbide

(v) Ethanol reacts with sodium at room temperature

Solution 1

Question 2

Give the structural formulae for the following :

(i) An isomer of n-butane

(ii) 2-propanol

(iii) Diethyl ether

Solution 2

(i) An isomer of n-butane

 

(ii) 2-propanol

 

(iii)Diethyl ether

Question 3

Give reasons for the following :

(i) Methane does not undergo addition reaction, but ethane does

(ii) Ethyne is more reactive than ethane

(iii) Hydrocarbons are excellent fuels

Solution 3

Reasons:

(i) Alkanes are saturated, i.e. they do not have a carbon-to-carbon double bond, and so do not undergo an addition reaction. Alkenes are said to be unsaturated because of the carbon-to-carbon double bond in their structure, and the double bond in alkenes makes them more reactive than alkanes.

(ii) Ethyne is a highly reactive compound due to the presence of a triple bond between its two carbon atoms.

(iii) Hydrocarbons are used as fuels because they burn in air producing a lot of heat energy. 

Question 4

Give balanced equation for the laboratory preparations of the following organic compounds:

(i) A saturated hydrocarbon from iodomethene

(ii) An unsaturated hydrocarbon from an alcohol

(iii) An unsaturated hydrocarbon from calcium carbide

(iv) An alcohol from ethyl bromide

Solution 4

Equations:

(i) CH₃I + 2[H] → CH₄ + HI

 Iodo Methane

(ii) CH₃CH₂OH + H₂SO₄→ CH₃CH₂HSO₄ + H₂O

 CH₃CH₂HSO₄→ CH₂=CH₂ + H₂SO₄

(iii)CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂↑ 

(iv) C₂H₅Br + NaOH → C₂H₅OH + NaBr 

Question 5

Identify this statement that is incorrect about alkanes.

(a) They are hydrocarbons

(b) There is a single covalent bond between carbon and hydrogen

(c) They can undergo both substitution as well as addition reactions

(d) On complete combustion they produce carbon dioxide and water

Solution 5

(c) They can undergo both substitution as well as addition reactions.

Question 6

(a) Identify the gas evolved when sodium propionate is heated with sodalime

(b) Give a chemical term for a reaction in which hydrogen of a alkane is replaced by a halogen

Solution 6

(a) Ethane

(b) Substitution

Question 7

Give a chemical test to distinguish between ethane gas and ethane gas.

Solution 7

Ethene gas decolourises the purple colour of KMnO₄, whereas ethane does not decolourise KMnO₄ solution.

Question 8

Give balanced equation for the labortary preparation of the following organic compounds:

(a) A saturated hydrocarbon from iodomethene

(b) An unsaturated hydrocarbon from an alcohol

(c) An unsaturdated hydrocarbon from calcium carbide

(d) An alcohol from ethyl bromide

Solution 8

Equations:

(i) CH₃I + 2[H] → CH₄ + HI 

(ii) CH₃CH₂OH + H₂SO₄→ CH₃CH₂HSO₄ + H₂O

  CH₃CH₂HSO₄→ CH₂=CH₂ + H₂SO₄

(iii) CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂↑ 

(iv) C₂H₅Br + NaOH → C₂H₅OH + NaBr 

Chapter 11F - Carboxylic acid Exercise 298

Question 1

Give the structural formula of the following

(i) Ethanol

(ii) 1-propanal

(iii) Ethanoic acid

(iv) 1,2,dichlormethene

Solution 1

(i) Ethanol: CH₃-CH₂-OH

(ii) 1-propanal

  

(iii) Ethanoic acid

  

(iv) 1,2, dichloromethene

  

Question 2

The IUPAC name of acetylene is

(a) Propane

(b) Propyne 

(c) Ethane

(d) ethyne 

Solution 2

(d) ethyne

Question 3

Write the IUPAC names of each of the following :

(i)  

 

(ii)  

 

(iii)

Solution 3

(a) Propene 

(b) But-1-yne 

(c) Ethane 

Question 4

Using their structural formulae identify the functional group by circling them :

(i) Dimethyl ether

(ii) propanone 

Solution 4

(i) Dimethyl ether

 

(ii) Propanone 

 

Question 5

Identify the statement which does not describe the property of alkenes:

(a) They are unsaturated hydrocarbons

(b) They decolourise bromine water

(c) They can undergo addition as well as substitution reactions

(d) They undergo combustion with oxygen forming carbon dioxide and water.

Solution 5

(c) They can undergo addition as well as substitution reactions.

Question 6

State the observation

When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.

Solution 6

The reddish brown colour of bromine solution gets decolourised.

Question 7

Name the following :

(i) Process by which ethane is obtained from ethane

(ii) A hydrocarbon which contributes towards the greenhouse effect

(iii) Distinctive reaction that takes place when ethanol is treated with acetic acid

(iv) The property of elements by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure

Solution 7

(i) Hydrogenation

(ii) Methane

(iii) Esterification 

(iv) Catenation

Question 8

Give balanced chemical equations for the following conversions :

(i) Ethanoic acid to ethyl ethanote

(ii) Calcium carbide to ethyne

(iii) Sodium ethanoate to methane

Solution 8

Chapter 11F - Carboxylic acid Exercise 299

Question 1

Give the structural formulae of each of the following :

(i) 2-methyl propane

(ii) Ethanoic acid

(iii) Butna-2ol

Solution 1

(i) 

(ii)  

(iii)   

Question 2

Equation for that reaction when compound A is bubbled through bromine dissolved in carbon trtrachloride is as follows :

DIAGRAM

(i) Draw the structure of A.

(ii) State your observation during this reaction

Solution 2

(i) 

(ii) When bromine dissolved in CCl₄ is added to ethene, the orange colour of bromine disappears because of the formation of colourless ethylene bromide. 

Question 3

Write a balanced chemical equation for each of the following:

(i) Burning of ethane in plentiful supply for air

(ii) Action of water on calcium carbide

(iii) Heating of ethanol at 170^oC in the presence of conc. Sulphuric acid

Solution 3

(i) 

(ii) 

(iii) 

Question 4

Choose the correct answer from the options given below :

If the molecular formula of an organic compouns is C₁₀H₁₈ it is

(a) Alkene 

(b) Alkane 

(c) Alkyne 

(d) Not a hydrocarbon

Solution 4

(3) alkyne

Alkyne has the general molecular formula CnH_2n-2.

Question 5

Fill in the blank.

The compound formed when ethane reacts with hydrogen is _________ (CH₄,C₂H₆,C₃H₆).

Solution 5

The compound formed when ethane reacts with hydrogen is C₂H₆. 

Question 6

Identify the underlined substance.

An organic compound containing -COOH functional group.

Solution 6

An organic compound containing -COOH functional group: carboxylic acid

Question 7

State are relevant observations for following reactant:

Addition of ethyl alcohol to acetic acid in presence of conc. H₂SO₄

Solution 7

On addition of ethyl alcohol to acetic acid in the presence of conc. H₂SO₄ at high temperature, sweet smelling ethyl acetate ester is produced, and the process is known as esterification.

C₂H₅OH + CH₃COOH  CH₃COOC₂H₅ + H₂O 

Question 8

Draw the structural formula for each of the following :

(i) 2, 3-dimethyl butane

(ii) Diethyl ether

(iii) Propanoic acid

Solution 8

(i) 2, 3-dimethyl butane

(ii) diethyl ether

(iii)propanoic acid

 

Question 9

Identify the term or substance based on the descriptions given below:

(i) Ice like crystals formed on cooling an organic acid sufficiently.

(ii) Hydrocarbon containing a triple bond used for welding purposes

(iii) The property by virtue of which the compound has the same molecular formula but different structural formulae.

(iv) The compound formed where two alkyl are linked by

 

 group

Solution 9

(i) Glacial acetic acid

(ii) Acetylene

(iii) Isomerism

(iv) Ketones 

Question 10

Give a balanced chemical equation for each of the following :

(i) Preparation of ethane from sodium propionate

(ii) Action of alcoholic KOH on bromoethane

Solution 10

(i) 

(ii)