question_answer

Which of the following reactions will not result in the formation of carbon-carbon bonds? [AIPMT (S) 2010]

A) Reimer-Tiemann reaction

B) Cannizaro reaction

C) Wurtz reaction

D) Friedel-Crafts acylation

Correct Answer: B

Solution :

[b] 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.