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(B) Decarboxylation involves the formation of a carbanion intermediate. The stability of the carbanion intermediate determines the rate of the reactio

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$I > II > III > IV$

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(B) Decarboxylation involves the formation of a carbanion intermediate. The stability of the carbanion intermediate determines the rate of the reaction. The stability order of the carbanions formed is $CH \equiv C^- > CH_2 = CH^- > CH_3 - CH_2^- > CH_3 - CH^- - CH_3$ due to the increasing electron-donating inductive effect of alkyl groups. Thus,the reactivity order toward decarboxylation is $I > II > III > IV$.

Arrange the following in order of their reactivity toward decarboxylation reaction:
$I. CH \equiv C - COOH$
$II. CH_2 = CH - COOH$
$III. CH_3 - CH_2 - COOH$
$IV. CH_3 - CH(CH_3) - COOH$

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Arrange the following in order of their reactivity toward decarboxylation reaction: $I. CH \equiv C - COOH$ $II. CH_2 = CH - COOH$ $III. CH_3 - CH_2 - COOH$ $IV. CH_3 - CH(CH_3) - COOH$