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Chemistry Question on Chemical Reactions

CH3−CO∣∣−CH3\ce−>[SeO2]X+Se+H2O:XCH_{3} - \overset{\underset{||}{O}}{C} - CH_{3} \ce{->[{SeO_{2}}]} X +Se +H_{2}O : X is

A

CH3−CO∣∣−CO∣∣−HCH_{3} - \overset{\underset{||}{O}}{C} - \overset{\underset{||}{O}}{C} -H

B

CH3−CO∣∣−OCH3CH_{3} - \overset{\underset{||}{O}}{C} - OCH_{3}

C

CH3−CO∣∣−CH2OHCH_{3} - \overset{\underset{||}{O}}{C} - CH_{2}OH

D

None of the above

Answer

CH3−CO∣∣−CO∣∣−HCH_{3} - \overset{\underset{||}{O}}{C} - \overset{\underset{||}{O}}{C} -H

Explanation

Solution

SeO2SeO _{2} oxidises compounds containing active methylene (i.e., CH2CH _{2} next to the carbonyl group) to another CO group.
CH3−CO∣∣−CH3\ce−>[SeO2]CH3−CO∣∣−CO∣∣−H+Se+H2OCH_{3} - \overset{\underset{||}{O}}{C} - CH_{3} \ce{->[{SeO_{2}}]} CH_{3} - \overset{\underset{||}{O}}{C}-\overset{\underset{||}{O}}{C}-H +Se+H_{2}O