Home
Class 12
CHEMISTRY
Assertion: The relative ease of dehydrat...

Assertion: The relative ease of dehydration of alcohols following order:
Tretiary `gt ` secondary `gt` Primary
Reason : Formation of carbocation is the slowest step of reaction.

A

If both assertion and reason are correct and reason is correct explanation for assertion.

B

If both assertion and reason are correct but reason is not correct explanation for assertion.

C

If assertion is correct but reason is incorrect.

D

If assertion and reason both are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation : Dehydration proceeds through the formation of carbocation intermediate in the rate determining step. The relative stabilities of the carbocations are in the order : tertiary `gt` secondary `gt` primary. Oxonium ion is formed by the protonation of alcohol in the first step.
Promotional Banner

Similar Questions

Explore conceptually related problems

The relative ease of dehydration of alcohols follows following order :

Consider the following statement about alcohol I.Acidic strength of alcohol follows the order : Primary > Secondary > Tertiary II. The relative ease of dehydration of alcohol follows the order: Primary > Secondary > Tertiary III. Acetone on reaction with CH_3MgBr gives secondary alcohol The correct statement(s) is/are

Discuss briefly, the relative rates of reaction of HBr with respect to primary, secondary and tertiary alcohols.

Assertion: The order of reactivity of alkyl halides towards S_(N^1) reaction in tertiary halidegtsecondary halidegtprimary halide. Reason: The reaction follows carbocation mechanism.

Alcohols undergo acid catalysed elimination reactions to produce alkenes. Because water is lost in the elimination , this reaction is called dehydration reaction. Secondary and tertiary alcohols always give E1 reaction in dehydration. Primary alcohols whose beta -carbon is branched also give E1 reaction. The reactivity of alcohol for elimination reaction is tertiary alcohol gt secondary school gt Primary alcohol. Identify the product in the given reaction :

What is the order of dehydration of primary, secondary and tertiary alcohols?

Statement - 1 POCl_(3) can be used to dehydrate alcohols Statement -2 This reaction proceeds by formation of carbocation in 1^(st) step

Assertion: The order of stability of carbocations is 3^(@) gt 2^(@) gt 1^(@) Reason: Carbon atom in carbocation is in sp^(3) state of hybridisation.

Alcohols undergo acid catalysed elimination reactions to produce alkenes. Because water is lost in the elimination , this reaction is called dehydration reaction. Secondary and tertiary alcohols always give E1 reaction in dehydration. Primary alcohols whose beta -carbon is branched also give E1 reaction. The reactivity of alcohol for elimination reaction is tertiary alcohol > secondary alcohol > Primary alcohol. Which of the following dehydration product (major ) is incorrect ?

A : The dehydration of ethyl alcohol in presence of Al_(2)O_(3) at 633 K gives ethene. R : The reaction proceed through the formation of carbocation intermediate.