Which of the following have only \( 2 \mathrm{H} \)-atom : (a) (b) ...

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Which of the following have only \( 2 \mathrm{H} \)-atom :
(a)
(b)
(c)
(d)
Correct code is :
(A) only \( a \) and \( b \)
(B) a, b and d
(C) a, c and d
(D) All of them
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