Which of the following reaction(s) leads to new C – C bond formation in major product

Engineering

Chemistry

Nucleophilic Substitution

Nucleophilic addition

Electrophilic substitution

Question

Which of the following reaction(s) leads to new C – C bond formation in major product

Kolbe electrolytic synthesis

Pinacole formation

Hunsdiecker reaction

Wurtz reaction

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All listed reactions involve carbon-carbon bond formation except Hunsdiecker reaction, which shortens the carbon chain.

Kolbe Electrolysis: Electrolysis of carboxylate salts gives alkanes. $2 R C O O_{-}^{} \to R - R$ (New C-C bond).

Pinacole Coupling: Aldehydes/ketones couple with Mg/Hg to form 1,2-diols (pinacoles) with a new C-C bond between carbonyl carbons.

Wurtz Reaction: Alkyl halides react with Na to form alkanes. $2 R X + 2 N a \to R - R$ (New C-C bond).

Hunsdiecker Reaction: Silver carboxylates with Br₂ give bromoalkanes, $R C O O_{A g} \to R B r$ (No new C-C bond; chain loses one carbon).

Final Answer: Kolbe electrolytic synthesis, Pinacole formation, and Wurtz reaction.