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 Multiple Choice QuestionsMultiple Choice Questions

1.

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.


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.


A.

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

Due to the presence of lone pair of electrons on the oxygen atom, ethers behave as the base and form stable oxonium salts with mineral acids.


3.

Gammexane is

  • benzene hexachloride

  • bromo benzene

  • benzyl chloride

  • chlorobenzene


A.

benzene hexachloride

Gammexane is benzene hexachloride. Its IUPAC name is 1,2,3,4,5,6-hexachlorocyclohexane.


4.

Dehydration of alcohol involves

  • carbene

  • carbanion

  • free radical

  • carbonium ion


D.

carbonium ion

The dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as sulfuric or phosphoric acid, at high temperatures. It involves carbonium ion in its mechanism.


5.

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


D.

Phenol gives salicylic acid in Reimer Tiemann reaction ,which on deoxidation with Zn powder ,give benzoic acid .

 


6.

Aniline on treatment with HCl and NaNO2 gives

  • diazo salt

  • nitroaniline

  • chloroaniline

  • aminophenol


A.

diazo salt

When aniline is treated with HCl and NaNO2, it forms benzene diazonium chloride. Therefore, it gives diazo salt. 


7.

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

  • red

  • yellow

  • blue

  • pink


C.

blue

Phenol gives Liebermann's nitroso test to give deep blue colour due to the formation of sodium salt of indophenol .

Phenol conc. H2SO4NaNO2 Blue HOH Red NaOH 


8.

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

  • AgNO3 solution after boiling with KOH

  • Ammonical cuprous chloride

  • Fehling solution

  • AgNO3


D.

AgNO3

Before using CHCl3 as an anaesthetic, it is treated with aqueous solution of AgNO3. A pure sample does not give ppt with aqueous AgNO3.


9.

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

  • Cannizzaro's reaction

  • Wurtz reaction

  • Kolbe reaction

  • Friedel-Craft's reaction


A.

Cannizzaro's reaction

Cannizzaro's reaction is the reaction where benzaldehyde changes in to benzyl alcohol.


10.

Which of following is the correct order of increasing reactivity?

  • RCOOR' < RCOCl < RCONH2

  • RCOOR' < RCONH2 < RCOCl

  • RCOCl < RCONH2 < RCOOR'

  • RCONH2 < RCOOR' < RCOCl


D.

RCONH2 < RCOOR' < RCOCl

Among all the given options, option c has the correct order of increasing reactivity.

RCOCl (Acid halide) < RCONH2 (Amide) < RCOOR (Ester)