The Question : Give reasons to support the answer:a. Presence of Alpha hydrogen in aldehydes and ketones is essential for aldol condensation. b. 3 –Hydroxy pentan-2-one shows positive Tollen’s test.b. 3 –Hydroxy pentan-2-one shows positive Tollen’s test.
Solution for the question :
(a) The alpha hydrogen atoms are acidic in nature due to the presence of electron with drawing carbonyl group. These can be easily removed by a base and the carbanion formed is resonance stabilized.
(b) Tollen’s reagent is a weak oxidizing agent not capable of breaking the C-C bond in ketones. Thus ketones cannot be oxidized using Tollen’s reagent itself gets reduced to Ag.
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