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  4. Compound A docs not give aldol condensation and Fehling's solution test but gives Tollen's reagent test. Compound A is

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Q. Compound $A$ docs not give aldol condensation and Fehling's solution test but gives Tollen's reagent test. Compound $A$ is

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Solution:

Benzaldehyde has no $\alpha-H$. So, it will not give aldol condensation. Benzaldehyde is a weak reducing agent. It reduces ammoniacal silver nitrate solution (Tollen’s reagent) to give silver mirror but does not reduce Fehling soluion.
$C_{6}H_{5}CHO+Ag_{2}O \to 2Ag+\underset{\text{Benzoic acid}}{{C_{6}H_{5}COOH}}$