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# Alcohols, Phenols and Ethers

#### Multiple Choice Questions

1.

Phenol , in Liebermann's nitroso test , give the colour :

• red

• yellow

• blue

• pink

2.

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

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

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

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

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

3.

Gammexane is

• benzene hexachloride

• bromo benzene

• benzyl chloride

• chlorobenzene

# 4.Assertion: Phenol is a weaker acid than ethanol.Reason: Groups with +M effect and -I effect decrease acidity at m-position.If both assertion and reason are true and reason is a correct explanation of the assertion. If both the assertion and reason are true but the reason is not a correct explanation of the assertion. If the assertion is true but the reason is false. If both the assertion and reason are false.

D.

If both the assertion and reason are false.

Phenol is a stronger acid than ethanol. This is due to the resonance stabilization of the phenolate ion which is produced after deprotonation.

But there is no such stabilization in the case of ethanol.

C2H5OH $⇌$C2H5O- + H+

The groups with +M and -I effect to decrease the acidity at p-position, but at m-position, the acidity is increased due to -I effect.

5.

Aniline on treatment with HCl and NaNO2 gives

• diazo salt

• nitroaniline

• chloroaniline

• aminophenol

6.

What is the name of reaction when benzaldehyde changes in to benzyl alcohol?

• Cannizzaro's reaction

• Wurtz reaction

• Kolbe reaction

• Friedel-Craft's reaction

7.

A sample of CHCl3 before using as an anaesthetic is tested by

• AgNO3 solution after boiling with KOH

• Ammonical cuprous chloride

• Fehling solution

• AgNO3

8.

Dehydration of alcohol involves

• carbene

• carbanion

• carbonium ion

9.

What will be the product ,when carboxy phenol ,obtained by Reimer Tiemann's process ,is deoxidised with Zn powder ?

10.

Which of following is the correct order of increasing reactivity?

• RCOOR' < RCOCl < RCONH2

• RCOOR' < RCONH2 < RCOCl

• RCOCl < RCONH2 < RCOOR'

• RCONH2 < RCOOR' < RCOCl