The compound that will react most readily with gaseous bromine has the formula (NEET 2017) (a) C H (b) C H (c) C H (d) C H

Alkenes that are not symmetric i.e. unsymmetrical are generally more reactive than alkenes, alkynes, and alkanes which are symmetric. Thus, propene is an unsymmetric alkene, hence more reactive while the remaining are symmetric. Hence, the correct option is (d).