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Byju's Answer
Standard XII
Chemistry
Acyl Substitution Revisited
The correct i...
Question

The correct increasing order of the reactivity of halides for SN1 reaction is:

A
CH3−CH2−X<(CH3)2CH−X<CH2=CH−CH2−X<Ph−CH2−X
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B
(CH3)2CH−X<CH3−CH2−X<CH2=CH−CH2−X<Ph−CH2−X
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C
Ph−CH2−X<(CH3)2CH−X<CH3−CH2−X<CH2=CH−CH2−X
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D
CH2=CH−CH2−X<Ph−CH2−X<(CH3)2CH−X<CH3−CH2−X
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Solution

The correct option is A CH3−CH2−X<(CH3)2CH−X<CH2=CH−CH2−X<Ph−CH2−X
Reactivity of alkyl halides for SN1 reaction is directly proportional to the stability of carbocation.
Carbocation formed are:
Benzylic carbocation is the most stable because positive charge can be delocalized over benzene ring. Allylic carbocation is more stable than 2∘ carbocation because it can show equvalent resonating structures.
2∘ carbocation is more stable than 1∘ carbocation.
The correct order is :
CH3−CH2−X<(CH3)2CH−X<CH2=CH−CH2−X<Ph−CH2−X

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