Question

Which of the following reaction will not result in the formation of C-C bonds?

• A. Wurtz reaction
• B. Friedel-Crafts acylation reaction
• C. Reimer-Tiemann reaction
• D. Cannizzaro reaction

Hint:

Cannizzaro reaction is a redox disproportionation reaction of aldehydes lacking \(\alpha\)-hydrogen atoms and does not involve carbon-carbon bond formation.

Answer 1

The Correct Option is D

Step 1: Examine Wurtz reaction.
\[ 2R-X + 2Na \rightarrow R-R + 2NaX \] A new C-C bond is formed. Therefore Wurtz reaction forms a carbon-carbon bond.

Step 2: Examine Friedel-Crafts acylation.
\[ Ar-H + RCOCl \xrightarrow{AlCl_3} Ar-COR \] The acyl group becomes attached to the aromatic ring through a new carbon-carbon bond. Hence C-C bond formation occurs.

Step 3: Examine Reimer-Tiemann reaction.
In this reaction an aldehyde group is introduced into phenol. The carbon of the formyl group becomes attached to the aromatic ring. Therefore a new carbon-carbon bond is formed.

Step 4: Examine Cannizzaro reaction.
Cannizzaro reaction is a disproportionation reaction. \[ 2RCHO + OH^- \rightarrow RCOO^- + RCH_2OH \] No new carbon-carbon bond is formed.

Step 5: Identify the correct answer.
The reaction that does not produce a C-C bond is Cannizzaro reaction. \[ {\text{Cannizzaro reaction}} \]