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Question: Answered & Verified by Expert

can't give decarboxylation while normally $\alpha-\beta$ unsaturated acid give this reaction because
ChemistryCarboxylic Acid DerivativesVITEEEVITEEE 2016
Options:
  • A t-butyl gp. has large size and does not let the $\mathrm{COOH}$ group to leave.
  • B t-butyl gp. can't extract $\mathrm{H}$ from $\mathrm{COOH}$.
  • C t-butyl gp. stabilise carbanion formed.
  • D t-butyl gp. does not allow this composition to convert to $\beta$ - $\gamma$-unsaturated acid
Solution:
2030 Upvotes Verified Answer
The correct answer is: t-butyl gp. stabilise carbanion formed.
Because of +I effect, t-butyl group destabilises the carbanion.

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