(a)
Interpretation:
The complete, detailed mechanism for the given reaction under basic condition is to be shown.
Concept introduction:
Under basic conditions, the nucleophile becomes stronger and the electrostatic attraction is increased when the uncharged nucleophile is converted into a negatively charged nucleophile.
(b)
Interpretation:
The complete, detailed mechanism for the given reaction under acidic condition is to be shown.
Concept introduction:
Under acidic conditions, the electrophile becomes stronger and the protonated carbonyl group acquires a larger partial positive charge on its C atom, stemming from its resonance contributor, and the carbonyl group is said to be activated toward nucleophilic attack.

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Chapter 18 Solutions
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