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The major product of the following reaction is: CH3CH2CH=CH2 H2 / Cr2O3, heat catalyst

1. CH3CH2CH=CH–CHO
2. CH3CH2CH=CH2
3. CH3CH2CH2CH2CHO
4. CH3CH2CH2CHO

Correct answer: CH3CH2CH=CH2

Solution

The reaction conditions involve hydrogenation with a catalyst, which typically saturates double bonds. However, since the starting material already contains a double bond and no further reaction occurs under the given conditions, the major product remains unchanged as CH3CH2CH=CH2.

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