A compound shows $[\mathrm{M}]^{+}$ at $m/z$ 84 and has base peak at 56. It exhibits only one peak in ${}^{1}\mathrm{H}$ NMR at $\delta$ 1.4 ppm and one signal in ${}^{13}\mathrm{C}$ NMR at $\delta$ 35 ppm. The compound is
(a)cyclobutane-1,3-dione
(b)dichloromethane
(c)cyclohexane
(d)1,2,3-trimethylcyclopropane
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
m/z 84 with base peak 56 (loss of C₂H₄), a single ¹H (δ 1.4) and a single ¹³C signal — cyclohexane (c).