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Q. Question
how many sp2 carbon atoms are present in the final product?

NTA AbhyasNTA Abhyas 2022

Solution:

This is an aldol condensation reaction.There are few steps take place in this reaction:
Step 1: Acid base reaction takes place in between base and alpha hydrogen of cyclo pentanone and carbanion is formed.
Step 2: In this step formed carbanion behaves as nucleophile and attacks on carbonyl compound carbon of other cyclo pentanone.
Step 3: Water gives proton and release hydroxide ion as shown below
Solution