Some Basic Principles Of Organic Chemistry Question 53
Question: Empirical formula of a compound is $ CH_2O $ and its vapour density is 30. Molecular formula of the compound is [MP PMT 1993; AIIMS 1998; CBSE PMT 2000; KCET (Med.) 2000; Pb. PMT 2000]
Options:
A) $ C_3H_6O_3 $
B) $ C_2H_4O_2 $
C) $ C_2H_4O $
D) $ CH_2O $
Show Answer
Answer:
Correct Answer: B
Solution:
Empirical Formula = $ CH_2O $ Empirical formula mass = 12 + 2 + 16 = 30 Mol.
Mass = 2 × V.D.
= 2 × 30 = 60 $ n=\frac{Mol\text{.},mass}{Empericalmass}=\frac{60}{30}=2 $ Molecular formula = $ {{\text{(Emperical formula)}}_{n}} $ = $ {{(CH_2O)}_2} $ = $ C_2H_4O_2 $ .
