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  4. Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?

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Q. Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?

AIPMTAIPMT 1994Aldehydes Ketones and Carboxylic Acids

Solution:

Only those aldehyde undergoes aldol condensation which have $\alpha$-hydrogen, so $CH_3 CH_2 CHO$ give this reaction because it contains $\alpha$-hydrogen atom. Aldol condensation proceed in presence of strong base. Aldol condensation are divided into two parts one is self aldol condensation and another is cross-aldol condensation. When both molecules are same called as self aldol and vice versa.