An organic compound has a vapour density of 22. The molecular formula of the organic compound is :
(a) CH4
(b) C2H4
(c) C2H6
(d) C3H8
Ans: (d) C3H8
To determine the molecular formula of the organic compound, we can use the vapour density and the atomic weights of carbon and hydrogen.
Step 1: Calculate the molecular weight
Vapour density (VD) is related to molecular weight (MW) by the following equation:
MW = 2 × VD
Given VD = 22
MW = 2 × 22
MW = 44
Step 2: Determine the molecular formula
Let’s analyze the options:
(a) CH4: MW = 12 + 4(1) = 16 (does not match)
(b) C2H4: MW = 2(12) + 4(1) = 28 (does not match)
(c) C2H6: MW = 2(12) + 6(1) = 30 (does not match)
(d) C3H8: MW = 3(12) + 8(1) = 44 (matches)
Therefore, the correct answer is:
(d) C3H8
