Consider the following reaction,
`H_(2)C=CH_(2) +underset(B)(Br_(2))overset(A)rarr underset(C)(BrCH_(2)CH_(2)Br)`
The reactant 'A' and colour of 'B' and 'C' are respectively

Options

A. `A rarr "CCl"_(4) B rarr "colourless C"rarr "reddish brown"`
B. `Ararr"CCl"_(4)Brarr "reddish brown" C" rarr colourless"`
C. `Ararr CBr_(4)` B `rarr ` colourless C `rarr` reddish brown
D. `Ararr CBr_(4)` B `rarr` reddish brown C `rarr` colourless

Answer

B

Explanation

Addition of bromine in `"CCl"_(4)` to an alkene resulting in discharnge of reddish brown colour of bromine constitutes an important method for detection of double bond in a molecule. The addition results in the synthesis of vic-dibromides, which is colourless.