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Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

Which is the least stable carbocation? I. CH3CH2C+H2CH_{3}CH_{2} \overset{+}{C}H_{2} II. CH3C+HCH3CH_{3}\overset{+}{C}HCH_{3} III. (CH3)4C+(CH_{3})_{4} \overset{+}{C} VI. (CH3)3CC+H2(CH_{3})_{3} C \overset{+}{C}H_{2}

A

I

B

II

C

III

D

IV

Answer

IV

Explanation

Solution

Stability of carbocation depends upon the number of hyperconjugative structures. More the hyperconjugative structure (i.e., more the number of hydrogen atoms attached directly to a-carbon atom), more is the stability of carbocation
Thus, the order of stability of given carbocation is

Thus, (CH3)3CCH2+(IV)(CH_{3})_{3}CC \overset{+}{H_{2}} (IV) is least stable carbocation among the given