A) $ CH_4 $
B) $ C_2H_4 $
C) $ C_6H_6 $
D) $ C_2H_2 $
Correct Answer: A
% of hydrogen = $ \frac{\text{Mass of hydrogen}}{\text{Mass of compound}}\ \times \ 100 $
$ CH_4=\frac{4}{16}\ \times \ 100\ =\ 25% $ .
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