The number of aldol reaction(s) that occurs in the given transformation is :-

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The number of aldol reactions in this transformation is 3.

* $α$ -Hydrogens: Acetaldehyde ( $C H_{3} C H O$ ) contains three active $α$ -hydrogen atoms.

* Aldol Additions: Each $α$ -hydrogen successively undergoes an aldol addition reaction with one molecule of formaldehyde ( $H C H O$ ).

* Intermediate: This repeats 3 times until all three $α$ -hydrogens are replaced by $- C H_{2} O H$ groups, forming $(H OC H_{2})_{3} C - C H O$ .

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