Correct Answer: Option C

Explanation

Empirical formula of organic liquid is XY

(Empirical formula) x n =  2 x Vapour density

           (XY) = 2 V.D

      (72 + 6)  = 2 V.D

          78 = 2 V.D

         V.D = \(\frac{78}{2}\)

         V.D = 39

There is an explanation video available below.

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