The correct functional group \( \mathrm{X} \) and the reagent/reaction conditions \( Y \) in the...

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The correct functional group \( \mathrm{X} \) and the reagent/reaction conditions \( Y \) in the following scheme are:
(a) \( \mathrm{X}=\mathrm{COOCH}_{3}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \) heat
(b) \( \mathrm{X}=\mathrm{CONH}_{2}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \) heat
(c) \( \mathrm{X}=\mathrm{CONH}_{2}, \mathrm{Y}=\mathrm{Br}_{2} / \mathrm{NaOH} \)
(d) \( \mathrm{X}=\mathrm{CN}, \mathrm{Y}=\mathrm{H}_{2} / \mathrm{Ni} / \) heat
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