A solution containing \( 1.8 \mathrm{~g} \) of a compound (empirical formula \( \mathrm{CH}_{2} ...

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A solution containing \( 1.8 \mathrm{~g} \) of a compound (empirical formula \( \mathrm{CH}_{2} \mathrm{O} \) ) in \( 40 \mathrm{~g} \) of water is observed to freeze at \( -0.465^{\circ} \mathrm{C} \). The molecular formula of the compound is \( \left(\mathrm{K}_{\mathrm{f}}\right. \) of water \( \left.=1.86 \mathrm{~kg} \mathrm{~K} \mathrm{~mol}^{-1}\right) \)
(a) \( \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2} \)
(b) \( \mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3} \)
(c) \( \mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4} \)
(d) \( \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6} \)
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