Kerala Syllabus Class 10 Chemistry Chapter 2. 'Chemical Reactions of Organic Compounds' Textbook Solutions

Let us assess

1. a) In which of the following situation is methane converted to chloromethane?

(i) Chlorine + sunlight

(ii) Hydrochloric acid + sunlight

(iii) Oxygen + temperature

(iv) Heating in the absence of oxygen

b) Write the name of such types of reactions.

Ans:

a) (i) Chlorine + sunlight

b) Substitution reactions

2. a) How many hydrogen molecules are required to convert CH ≡ CH (ethyne) into C₂H₆(ethane)?

b) Write the chemical equation of the reaction.

c) To which category does this chemical reaction belong?

Ans: 

a) 2 molecules of hydrogen

b) CH ≡ CH + 2H₂ → C₂H₆

c) Addition reaction

3. a) Complete the chemical equation.

i) CH ≡ CH + HCl → A

ii) n A → B

b) Write the IUPAC names of the molecules A and B.

c) To which category does each of these chemical reactions belong?

Ans:

a) (i) A - CH₂ = CHCl

   ii) B -

b) A - Chloroethene

    B - Polyvinyl chloride

c) i - Addition reaction

    ii - Polymerisation 

4. a) Which of the given polymers is used to coat the inner surface of cookware?

(Polythene, polyvinyl chloride, teflon)

b) What is the monomer of this polymer?

Ans:

a) Teflon

b) Tetrafluoroethene

5. a) Which among the following is a condensation polymer?

(Polyvinyl chloride, nylon 66, teflon)

b) What are the monomers of nylon 66?

Ans:

a) Nylon 66

b) Adipic acid and Hexamethylenediamine

6. 

a) Identify A, B, C and D in the given chemical reactions.

b) What is wash?

c) How is rectified spirit obtained from wash?

d) What is the purpose of denaturing rectified spirit?

Ans:

a) A - Invertase

   B - C₆H₁₂O₆

   C - Zymase

   D - CO₂

b) 8-10% ethanol is known as ‘wash’.

c) When wash is subjected to fractional distillation, 95.6% of ethanol is obtained. This is known as rectified spirit.

d) The purpose of denaturing rectified spirit is to prevent its misuse as a beverage.

7. a) How is ethanoic acid prepared industrially?

b) 5 - 8% ethanoic acid is called ...................

Ans:

a) Ethanoic acid is prepared industrially by treating methanol

with carbon monoxide in the presence of a catalyst.

b) Vinegar

8. 

Analyse the equation and answer the following questions.

a) What is the name of this chemical reaction?

b) What is the name of the ester formed?

c) Write any two uses of esters.

Ans:

a) Esterification

b) Methyl ethanoate

c)As esters have the fragrance of flowers and fruits, they are used to make artificial perfumes and juices.

A methyl ester, methyl salicylate can relieves the pain of joints and muscles.