Assertion: Dehydration of alcohols can be carried out with conc. $H_{2} S O_{4}$ but not with conc. $H C l$ .
Reason: $H_{2} S O_{4}$ is dibasic while $H C l$ is monobasic.

Question

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Answer 1

Dehydration of alcohols can be carried out with conc. $H_{2} S O_{4}$ as it is a dehydrating agent and removes a molecule of water from alcohols resulting in the formation of alkenes at higher temperatures. Conc. $H C l$ is not a dehydrating agent.
$H_{2} S O_{4}$ is indeed a dibasic acid and $H C l$ is not. But it is not the reason that $H C l$ is not a dehydrating agent.

So, both assertion and reason are true but the reason is not the correct explanation to assertion.
The correct option is 'B'.

Answer 2

Dehydration of alcohols can be carried out with conc.

H_{2} S O_{4}

as it is a dehydrating agent and removes a molecule of water from alcohols resulting in the formation of alkenes at higher temperatures. Conc.

H C l

is not a dehydrating agent.

H_{2} S O_{4}

is indeed a dibasic acid and

H C l

is not. But it is not the reason that

H C l

is not a dehydrating agent.

So, both assertion and reason are true but the reason is not the correct explanation to assertion.

The correct option is 'B'.