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Question
Through which of the following reactions number of carbon atoms can be increased in the chain?
(i) Grignard reaction
(ii) Cannizaro’s reaction
(iii) Aldol condensation
(iv) HVZ reaction
Solution
(i) Grignard reaction
(iii) Aldol condensation
Explanation:
Grignard reagent is used to add number of carbon atom in chain.
\[\begin{array}{cc}
\phantom{....................}\ce{R'}\\
\phantom{...................}|\\
\ce{RCHO + R'MgX ->[H2O] R - CH - OH}
\end{array}\]
Aldol condensation involves condensation of aldehydes and ketones with α-hydrogen.
\[\begin{array}{cc}
\ce{CH3CHO ->[dil NaOH] CH3CHCH2CHO ->[Δ][-H2O] CH3CH = CHCHO}\\
|\phantom{..............}\\
\ce{\underset{Aldol}{OH}\phantom{............}}\\
\end{array}\]
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