Which one of the following reagents converts \( -\mathrm{CO}- \) group into \( -\mathrm{CH}_{2}-...

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Which one of the following reagents converts \( -\mathrm{CO}- \) group into \( -\mathrm{CH}_{2}- \) group?
(a) \( \mathrm{LiAlH}_{4} \)
(b) \( \mathrm{NaBH}_{4} \)
(c) \( \mathrm{NH}_{2}-\mathrm{NH}_{2} / \mathrm{OH} \)
(d) \( \mathrm{Na} / \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \)
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