During dehydration of alcohols to alkenes by heating with conc. H₂SO₄ , the initial step is :

• formation of an este

• protonation of alcohol molecule

• formation of carbocation

• elimination of water

Assertion : Phenol is more acidic than ethanol.

Reason : Phenoxide ion is 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.

73.

The condensation product of reaction between phenol and phthalic anhydride :

• methyl orange

• salicylic acid

• phenol red

• phenolphthalein

The IUPAC name of  is :

• 1 , 2 , 3 - propane tri-ol

• 3 - hydroxy butanoic acid

• 1 , 2 - ethane di-ol

• 3 - methyl butanol - 1

Catalytic dehydrogenation of a primary alcohol gives a :

• secondary alcohol

• aldehyde

• ketone

• ester

Among the following, which is least acidic ?

• phenol

• o-cresol

• p-nitrophenol

• p-chlorophenol

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

• benzaldehyde

• benzyl alcohol

• toluene

• benzene

During the dehydration of alcohols to alkenes by heating with conc. H₂SO₄ the initiating step is

• elimination of water

• protonation of an alcohol molecule

• formation of an ester

• formation of carbocation.

Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers.

Reason : Change in colour is due to complexation of alcohol with potassium dichromate.

• 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: Phenol undergoes Kolbe's reaction whereas ethanol does not.

Reason : Phenoxide ion is more basic than ethoxide ion.

• 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.