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An organic compound A with the formula C3H7O2 undergoes the following transformations: 1. Reaction with water produces CH3–CH–C–OH || O 2. Reaction with ammonia gives CH3–CH–C–NH2 || O 3. Reaction with acetic acid forms CH3–CH–C–O–C–CH3 || O Identify compound A.

1. CH3—CH=C—CHO
2. CH2=CH—CH—CHO
3. CH3—CH2—C=O
4. CH3—CH2—C—CH2 || CH2

Correct answer: CH3—CH=C—CHO

Solution

The transformations indicate that A is an aldehyde capable of forming the corresponding acid with water, amide with ammonia, and ester with acetic acid. The structure that fits these reactions is CH3—CH=C—CHO.

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