Question

A hydrocarbon `X` has molar mass 84 but contains no double or triple bonds. Also `X` has no methyl locant. How many different `IUPAC` name can be assigned to `X` ?
A. 4
B. 3
C. 2
D. 6

Answer 1

Correct Answer - a
Molar mass 84 is a multiple of 14 hence, `X` is based on general formula `C_(n)H_(2n)` with molar mass `14n.` Here, `n` is `6` and `X` is `C_(6)A_(12)`. As `X` gas no double bond, it must be a cyclalkane. Cycloalkanes without methyl as locant are