A carbonyl compound with molecular formula C5H10O reacted with iodine in an alkaline solution to give a pale yellow precipitate with an antiseptic smell.The carbonyl compound is:
Correct answer: B. CH3CH2CH2COCH3
- A. CH3CH2CH3CH3CHO
- B. CH3CH2CH2COCH3
- C. CH3CH2CH(CH3)CHO
- D. CH3CH2COCH2CH3
Explanation
b) CH3CH2CH2COCH3:This compound is 2-pentanone, which is a ketone with the molecular formula C5H10O. It is a likely candidate for the carbonyl compound in question. When reacted with iodine in an alkaline solution, it can form a pale yellow precipitate with an antiseptic smell.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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