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(A) The stability of carbocations is determined by the inductive effect and hyperconjugation.Greater the number of alkyl groups attached to the positi

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$(CH_3)_3\stackrel{+}{C} > (CH_3)_2\stackrel{+}{C}H > CH_3\stackrel{+}{C}H_2 > \stackrel{+}{C}H_3$

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(A) The stability of carbocations is determined by the inductive effect and hyperconjugation.Greater the number of alkyl groups attached to the positively charged carbon atom,greater is the stability due to the $+I$ effect and hyperconjugation.$(CH_3)_3\stackrel{+}{C}$ is a tertiary carbocation (most stable).$(CH_3)_2\stackrel{+}{C}H$ is a secondary carbocation.$CH_3\stackrel{+}{C}H_2$ is a primary carbocation.$\stackrel{+}{C}H_3$ is a methyl carbocation (least stable).Therefore,the decreasing order of stability is: $(CH_3)_3\stackrel{+}{C} > (CH_3)_2\stackrel{+}{C}H > CH_3\stackrel{+}{C}H_2 > \stackrel{+}{C}H_3$.

Arrange the following carbocations in decreasing order of their stability:
$\stackrel{+}{C}H_3, (CH_3)_3\stackrel{+}{C}, CH_3\stackrel{+}{C}H_2, (CH_3)_2\stackrel{+}{C}H$

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Arrange the following carbocations in decreasing order of their stability:$\stackrel{+}{C}H_3, (CH_3)_3\stackrel{+}{C}, CH_3\stackrel{+}{C}H_2, (CH_3)_2\stackrel{+}{C}H$