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Question
In which of the following pairs of carbocations, the first carbocation is more stable than the second?
(i) CH2=CH−+CH2 and CH2=CH−CH2−+CH2(ii) CH3−NH−+CH2 and +CH2−OH(iii) CH3−O−CH2−+CH2 and CH2−O−+CH2(iv) CH3−+CH−CH2CH2CH3 and CH3CH2−+CH−CH2CH3
In which of the following pairs of carbocations, the first carbocation is more stable than the second?
(i) CH2=CH−+CH2 and CH2=CH−CH2−+CH2
(ii) CH3−NH−+CH2 and +CH2−OH
(iii) CH3−O−CH2−+CH2 and CH2−O−+CH2
(iv) CH3−+CH−CH2CH2CH3 and CH3CH2−+CH−CH2CH3
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Solution
The correct option is B (i), (ii) and (iv)
(i). Allylic carbocation is more stable than a non-allylic carbocation
(ii). CH3−NH−CH+2 is more stable than CH+2−OH because of negative inductive effect.
(iii). More αH more hyperconjugation. CH3−CH+−C3H7 have 5αH whereas C2H5−CH+−C2H5 have only 4αH
Hence, the correct option is B
(i). Allylic carbocation is more stable than a non-allylic carbocation
(ii). CH3−NH−CH+2 is more stable than CH+2−OH because of negative inductive effect.
(iii). More αH more hyperconjugation. CH3−CH+−C3H7 have 5αH whereas C2H5−CH+−C2H5 have only 4αH
Hence, the correct option is B
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