Which of the following compounds will form an osazone derivative?

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

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

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

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

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Solution

The correct option is A $C H_{3} C H_{2} C O C H_{2} O H$
When sugars are reacted with excess of phenylhydrazine osazone formation takes place.
Osazone will form in that sugar only where keto hydroxy group is present.
Thus $C H_{3} C H_{2} - C O - C H_{2} - O H$ will form an osazone derivative; as it has keto hydroxy group.

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