Propose a structure consistent with each set of data.
a. A compound that contains a benzene ring and has a molecular ion at m/z = 107.
b. A hydrocarbon that contains only sp3 hybridized carbons and a molecular ion at m/z = 84.
c. A compound that contains a carbonyl group and gives a molecular ion at m/z = 114.
d. A compound that contains C, H, N, and O and has an exact mass for the molecular ion at 101.0841.