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Q.
Which of the following will undergo aldol condensation?
IIT JEEIIT JEE 1998Aldehydes Ketones and Carboxylic Acids
Solution:
All carbonyl compounds containing $\alpha-H$ or $\alpha-D$ undergo aldol condensation. In given example, benzaldehyde does not contain $\alpha-H$ to $-CHO$, hence does not undergo aldol condensation.