The carboxylic acid which reduces Tollen's reagent is

H C O O H

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C H_{3} C O O H

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C H_{3} C H_{2} C O O H

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C H_{3} C H_{2} C H_{2} C O O H

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Solution

The correct option is B $H C O O H$
Formic acid ( $H C O O H$ ) is not a true acid, it contains both aldehyde ( $- C H O$ ) as well as carboxyl group ( $- C O O H$ ), and it behaves as a reducing agent. Therefore, Formic acid reduces Tollen's reagent to metallic Silver. Hence option (A) is correct

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p K_{a}

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An organic compound 'X' gives brisk effervescence with NaHCO₃ and also reduces Tollen's reagent. 'X' is

C H_{3} C O O H

C H_{3} C H_{2} C O O H

C_{6} H_{5} C O O H

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