$X$ and $Y$ can respectively be
(a) $\mathrm{H}$ and $\mathrm{H}$
(b) $\mathrm{H}$ and $\mathrm{C} _2 \mathrm{H} _5$
(c) $\mathrm{C} _2 \mathrm{H} _5$ and $\mathrm{H}$
(d) $\mathrm{CH} _3$ and $\mathrm{CH} _3$
(2010)
Correct Answer: 54. ( b, d )
Solution:
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