Question

If the empirical formula of an organic compound is $C{H}_{2}O$, then its molecular formula can be

• A. C₂H₂O
• B. C₂H₄O
• C. C₃H₆O
• D. C₆H₁₂O₆

Answer 1

The correct option is D

C₆H₁₂O₆

The explanation for the correct option:

• The molecular mass of $C{H}_{2}O$ is $12+(2\times 1)+16=30g$.
• The molecular mass of $C_6{H}_{12}{O}_6$ is $(12\times 6)+(12\times 1)+(6\times 16)=180g$.
• As the molecular mass of $C_6{H}_{12}{O}_6$is the multiple of $30$. Therefore it is the correct answer.

The explanation for incorrect options:

The molecular mass of $C_2{H}_{4}O$ is $(12\times 2)+(4\times 1)+16=44g$.

The molecular mass of $C_3{H}_{6}O$ is $(3\times 12)+(6\times 1)+16=58g$.

The molecular mass of $C_2{H}_{2}O$ is $(2\times 12)+(2\times 1)+16=42g$.

As these molecular masses are not multiple of the molecular mass of $C{H}_{2}O$.So they are incorrect.