A) \[C{{H}_{3}}-C{{H}_{2}}-X<{{(C{{H}_{3}})}_{2}}CH-X\]\[<C{{H}_{2}}=CH-C{{H}_{2}}-X<PhC{{H}_{2}}-X\]
B) \[{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{3}}-C{{H}_{2}}-X\]\[<C{{H}_{2}}=CH-C{{H}_{2}}X<PhC{{H}_{2}}-X\]
C) \[PhC{{H}_{2}}-X<{{(C{{H}_{3}})}_{2}}CH-X\]\[<C{{H}_{3}}-C{{H}_{2}}-X<C{{H}_{2}}=CH-C{{H}_{2}}-X\]
D) \[C{{H}_{2}}=CH-C{{H}_{2}}-X<Ph-C{{H}_{2}}-X\]\[<{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{3}}-C{{H}_{2}}-X\]
Correct Answer: A
Solution :
The relative stability of alkyl carbocation is due to inductive effect and hyperconjugation, while that of stable carbocation is due to resonance. The order is: \[C{{H}_{3}}C{{H}_{2}}X<{{(C{{H}_{3}})}_{2}}CH-X\] \[<C{{H}_{2}}=CH-C{{H}_{2}}X<PhC{{H}_{2}}-X.\]
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