Question

Arrange the following according to the instruction given in bracket:

C₂H₂, C₃H₆, CH₄, C₂H₄ (In the increasing order of the molecular weight)

Answer 1

Molecular weight:

CH₄ = 12 + 4 = 16

C₂H₂ = 12 × 2 + 2 × 1 = 26

C₂H₄ = 12 × 2 + 4 × 1 = 28

C₃H₆ = 12 × 3 + 6 × 1 = 42

Hence, the increasing order of molecular weights is:

CH₄ < C₂H₂ < C₂H₄ < C₃H₆