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-R Effect

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On the basis of hyperconjugation and inductive effect, which of isobutyl carbocation and n-butyl carbocation is more stable and why?

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Q. A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?

A carbocation is a group of atoms with a positively charged carbon atom having six electrons in the valence shell after sharing. Carbocations are formed in the heterolysis of a bond and are planar species. Stability of carbocation is determined by inductive effect, hyperconjugation and resonance effect. Greater the number of contributing structures more is the stability of a Carbocation. Electron releasing groups (+I effect) increases the stability of a carbocation whereas the electron withdrawing groups (I effect) have an opposite effect.

Which of the following is most stable carbocation?

Q. A benzyl carbocation is more stable than a secondary butyl carbocation mainly because of which of the following?

Q. How many carbocations given below are more stable than sec. butyl carbocation?
T-butyl carbocation, Benzyl carbocation, Allyl carbocation, Cyclopropebyl cation, Tropylium cation, n-butyl carbocation, n-Propyl carbocation, cyclopropylmethyl carbocation :

Q. Statement-I :

M e_{3} + C

is more stable than

M e_{2} + C H

M e_{2} + C H

is more stable than the

M e + C H_{2}

.
Statement-II : Greater the number of hyperconjugative structures, more is the stability of carbocation.

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