841.

In which of the following reactions carbon-carbon bond formation takes place ?

• Cannizaro

• Reimer - Tiemann

• HVZ reaction

• Schmidt reaction

Which gives only mono - substituted product ?

• o - dinitrobenzene

• m - dinitrobenzene

• p - dinitrobenzene

• Nitrobenzene

Assertion: Phenol is more reactive than benzene towards electrophilic substitution reaction.

Reason : In the case of phenol, the intermediate carbocation is more resonance stabilised.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

.

Benzoic acid is treated with lithium aluminium hydride. The compound obtained is

• benzaldehyde

• benzyl alcohol

• toluene

• benzene

Phenol and benzoic acid are distinguished by :

• NaOH

• NaHCO₃

• Na₂CO₃

• H₂SO₄

Assertion : 2-Butanol on heating with H₂SO₄ gives 1-butene and 2-butene.

Reason : Dehydration of 2-butanol follows Saytzeff's rule.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Ethers behave as bases in the presence of mineral acids.

Reason : It is due to the presence of lone pair of electrons on the oxygen.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Benzene diazonium salt on boiling with water forms phenol.

Reason : C- N bond is polar.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Phenol on reaction with Br₂ gives :

• O - Bromo phenol

• p - Bromo phenol

• 2 , 4 , 6 tribromo phenol

• 1 , 3 , 5 tribromo benzene