JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Alcohols Phenols and Ethers

Experimentally reducing a functional group cannot be done by which one of the following reagents?

(A) $Na / H_{2}$ ✓ Correct
(B) $Pt - C / H_{2}$
(C) $Pd - C / H_{2}$
(D) $Zn / H_{2} O$

Answer: (A)

Solution

Catalytic hydrogenation reduces functional groups only when molecular hydrogen is activated on a transition-metal catalyst such as platinum or palladium, which both

Pt - C/ H_{2}

and

Pd - C/ H_{2}

provide, while zinc in water supplies electrons for reduction. Sodium is not a hydrogenation catalyst, so

Na/ H_{2}

is not a working reducing system and cannot reduce a functional group.

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Single correct option

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