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Which reagent can convert C6H5CH=CHCHO into C6H5CH=CHCH2OH without affecting the carbon–carbon double bond?

1. H2/Ni
2. NaBH4
3. K2Cr2O7/H+
4. Both H2/Ni and NaBH4

Correct answer: NaBH4

Solution

NaBH4 is a selective reducing agent that can reduce aldehydes to alcohols without affecting carbon–carbon double bonds, making it suitable for converting the given compound into the desired alcohol.

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