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Which one of the following reacts with $H C N$ and Tollen's reagent, but is not oxidised by Fehling's solution
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Acetone
Acetaldehyde have $\mathrm{CH}_3 \mathrm{CO}-$ group so it give positive iodoform test with $I_2$ and $\mathrm{NaOH}$ while formaldehyde does not have $-\mathrm{CH}_3 \mathrm{CO}$ group so it will not give the positive haloform test.
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