Class XI Chemistry Hydrocarbons 7

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Question 1

Which of the following is Wurtz – Fittig reaction–

• AC₆H₅I+ 2Na + ICH₃→C₆H₅ –CH₃+2NaI
• BC₆H₅I+ Cu + IC₆H₅→ C₆H₅ – C₆H₅+CuI₂
• CCH₃I+ 2Na + ICH₃→CH₃ – CH₃ + 2NaI
• DNone of the above

Question 2

The correct order of reactivity towards electrophilic substitution is:

• ABenzoic acid > chlorobenzene > benzene > phenol
• BBenzoic acid > phenol > benzene > chlorobenzene
• CPhenol > benzene > chlorobenzene > benzoic acid
• DPhenol > chlorobenzene > benzene > benzoic acid

Question 3

In the reaction sequence C₆H₆ (X) (Y) the product (Y) is :

• Achlorobenzene
• Bbenzaldehyde
• Cbenzoic acid
• Dbenzene

Question 4

The electrophile involved in chlorination of benzene is –

• Achloride ion
• BChloronium ion
• CNitronium ion
• DNone of the above

Question 5

Benzene reacts with fuming sulphuric acid to give-

• ASodium benzene sulphonate
• BBenzene sulphonic acid
• CSodium benzoate
• DAll the above

Question 6

Benzene reacts with benzoyl chloride to form–

• Abenzophenone
• BAcetophenone
• CBenzylchloride
• DMaleic anhydride

Question 7

Functional groups Y, –CH = CH₂ and X respectively are ... and ... directing.

• AMeta, ortho–para and ortho–para
• BMeta, meta and meta
• CMeta, ortho–para and meta
• DAll the three ortho–para

Question 8

Consider following statements about benzene:
I: Heats of hydrogenation of benzene and 1,3,5-cyclohexatriene are identical.
II: Benzene is much more stable than expected for 1,3,5-cyclohexatriene.
III: All carbon-carbon bonds (single and double) have equal length .
Select correct statements:

• AI, II
• BII, III
• CI, III
• DI, II, III

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