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Synthesis of Aldehydes and Ketones Using Carboxylic Acid and Its Derivatives

Which of the ...

Question

Which of the following compounds will give a coloured crystalline compound with the above compound ?

C H_{3} C O C l

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C H_{3} C O O C_{2} H_{5}

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C H_{3} C O C H_{3}

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C H_{3} C O N H_{2}

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Solution

The correct option is B $C H_{3} C O C H_{3}$
A positive 2,4-DNP test means that your unknown contains either an aldehyde or ketone, while a negative test tells you that it doesn't. It's actually the hydrazine group that reacts with the aldehyde or ketone, producing a positive test.

Hence, option C is correct.

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Which of the above compounds on being warmed with iodine solution and NaOH will give Iodoform?

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