The molar mass of a compound X is 56. its empirical formula is CH2. X is?

A. butene.
B. butyne.
C. ethene.
D. propene.
E. propyne

Correct Answer:

Option A – butene

Explanation

(CH₂)x=56
(12+2)x=56
14x=56
x=56/14
x=4
Hence, the empirical formula is (CH₂)×4

= C₄H₈