question_answer

Which of the following reactions will not result in the formation of carbon-carbon bonds?

A) Reimer-Tiemann reaction

B) Cannizaro reaction

C) Wurtz reaction

D) Friedel-Crafts acylation

Correct Answer: B

Solution :

Reimer-Tiemann reaction, (Here, a new C?C bond is formed.) Cannizaro reaction, \[\text{2HCHO}\xrightarrow[{}]{\text{Conc}\text{.}\,\text{NaOH}}\text{C}{{\text{H}}_{\text{3}}}\text{OH}\,\text{+}\,\text{HCOONa}\] (No new C?C bond is formed in this reaction.) Wurtz reaction,                 \[2RX+dry\,Na\xrightarrow[{}]{Ether}R-R\] (One new C?C bond is formed.) Friedel-Crafts acylation,   (New C?C bond is formed.) Thus, among the given reactions, only Cannizaro reaction does not involve the formation of a new C?C bond.