Question

The molecular mass of an organic compound is 78. Its empirical formula is CH. The molecular formula is 

(A) C₂H₄ 

(B) C₂H₂ 

(C) C6H₆ 

(D) C4H₄ 

Answer 1

The molecular mass of an organic compound is 78. Its empirical formula is CH. The molecular formula is  C₆H_{6 .}

_{Explanation :-}

In C₆H₆, 

 Total number of C = 12 × 6 = 72 

 Total number of H = 1 × 6 = 6 

∴ Molecular mass = 78.