Identify \( A \) and \( B, C \) in the given sequence of reactions,...
Identify \( A \) and \( B, C \) in the given sequence of reactions,
\[
\mathrm{H}_{2} \mathrm{C}=\underset{A}{\mathrm{CH}_{2}}+\underset{(B \text { colour }) B}{\mathrm{Br}_{2}} \stackrel{A}{\longrightarrow} \underset{C}{\mathrm{BrCH}_{2} \mathrm{CH}_{2}} \underset{(C)}{\mathrm{Br}}
\]
(a) \( \mathrm{CCl}_{4} \) Colourless Reddish brown
(b) \( \mathrm{CCl}_{4} \) Reddishbrown Colourless
(c) \( \mathrm{CBr}_{4} \) Colourless Reddish brown
(d) \( \mathrm{CBr}_{4} \quad \) Reddish brown Colourless
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