1.
Cyclopentene undergoes the following sequence:

Cyclopentene→NBS, CCl4, hνA→alc. KOH, ΔB\text{Cyclopentene} \xrightarrow{\text{NBS},\,\mathrm{CCl_4},\,h\nu} A \xrightarrow{\text{alc.}\,\mathrm{KOH},\,\Delta} B

Identify product B.