42
45
126
180
Correct answer is D
Molecular formula = (empirical formula x n)
where n= (1,2,3,...)
\(CH_{2}O = 12 + (2\times 1) + 16 = 30\)
Relative molecular mass = (30 x n)
From the options, only 180 is a multiple of 30, when n=6.
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