The empirical formula of a compound is CH2O. If its VD is 30, then its molecular formula is :

\\A. \quad \mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}$ \\ $\mathrm{B}. \quad \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}$ \\$\mathrm{C}. \quad \mathrm{CH}_{2} \mathrm{O}$ \\$\mathrm{D}. \quad \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}$

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