Identify A and B CaC 2 → H 2 O A → B ( i ) NaNH 2 CH 3 - C ≡ C - CH 3

When calcium carbide is treated with water, ethyne is obtained. CaC 2 + 2 H 2 O → Ca ( OH ) 2 + C 2 H 2 Reaction of alkyne with Na in liq . NH 3 or NaNH 2 ,Alkynes form monosodium ethynide and disodium ethynide H - C = C — H + NaNH 2 → H — C = C - Na + Sodium propynide + NH 3 H — C = C - Na + Sodium propynide + 2 CH 3 - Cl → CH 3 - C = C - CH 3 + NaCl So A is C 2 H 2 and B is CH 3 Cl . CaC 2 → H 2 O C 2 H 2 → CH 3 Cl ( i ) NaNH 2 CH 3 - C ≡ C - CH 3

E M B I B E

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 17

HARD

11th ICSE

IMPORTANT

Earn 100

Write chemical equation for combustion reaction of the following hydrocarbons.

Butane

Important Questions on Hydrocarbons

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 17

Write chemical equation for combustion reaction of the following hydrocarbons.

Pentene

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 17

Identify A and B

${CaC}_{2} \overset{H_{2} O}{\to} A \to_{B}^{(i) {NaNH}_{2}} {CH}_{3} - C \equiv C - {CH}_{3}$

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 18

Explain how

— OH

is ortho and para-directing group whereas

— {NO}_{2}

is meta-directing.

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 18

What conclusion is drawn from the fact that benzene forms a single

C_{6} H_{5} - Br

product when it is monobrominated?

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 18

How does benzene react with fuming sulphuric acid? Give reaction.

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 19

How will you convert benzene into acetophenone

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 19

How will you convert benzene into methyl benzene (toluene).

HARD

11th ICSE

IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 13 - Hydrocarbons>Chapter Practice>Q 20

Explain the terms substitution and addition reactions? Methane gives substitution reaction while ethylene gives addition reaction. Justify the statement giving two examples in each case.