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An organic compound A with the formula C3H7O2 undergoes the following transformations: 1. Reacting with water produces CH3—CH—C—OH || O 2. Reacting with ammonia gives CH3—CH—C—NH2 || O 3. Reacting 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

Compound A is identified as CH3—CH=C—CHO based on its reactions with water, ammonia, and acetic acid, which produce specific products that are consistent with the structure of this compound.

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