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B
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C
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D
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Solution
The correct option is C Aldehydes and α-hydroxyketones reduce Tollen's reagent. Only formic acid gives positive Tollen's test. α-Hydroxyketones gives positive Tollen's test because in basic condition they tautomerise into α-hydroxyaldehydes.
Hence, option (a), (b) and (c) are the correct answers.