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Q. The product formed in an aldol reaction is:

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Solution:

In an aldol condensation reaction, a few steps take place in this reaction:
Step 1: Acid-base reaction takes place in between base and alpha hydrogen of ethanal and carbanion is formed.
Step 2: In this step formed carbanion behaves as nucleophile and attack carbonyl compound carbon (ethanal).
Step 3: Water gives proton to form a $\beta -$ hydroxy aldehyde or ketone and release hydroxide ion by following heating effect in which alkene is formed as shown below:
Solution