Diagnostic Test 9 Diagnostic Test - MCAT Biology

Consider the following radical bromination reaction of propane.

$CH_{3}CH_{_{2}}CH_{3} + Br_{2} \rightarrow CH_{3}CHBrCH_{3} + HBr$

Which of the following substances would NOT be a suitable radical initiator for this reaction?

What intermediate is involved in the conversion of compound B to compound C?