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

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

AIPMTAIPMT 2010Aldehydes Ketones and Carboxylic Acids

Solution:

(a) Reimer-Tiemann reaction, (Here, a new C - C bond is formed.) Riemer-Tiemann reaction is an electrophilic substitution reaction. Cannizaro reaction (disproportionation reaction) In this reaction, 1-molecule of $HCHO$ convert in methanol and another molecule convert in salt. $2\, HCHO \xrightarrow{Conc. NaOH}CH_3OH+HCOONa$
(No new C-C bond is formed in this reaction.)
(c) Wurtz reaction, $R-X+2Na+R'X+dry\, Na \xrightarrow{Ether}R-R$ Here, R and R'must be equal otherwise mixture of alkanes will form
(One new C-C bond is formed).
(d) Friedel-Craft's 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.

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