The major product expected when (r)-3-methylhexane reacts with bromine in the presence of light is the major product expected when (r)-3-methylhexane reacts with bromine in the presence of light is (s)-3-bromo-3-methylhexane a mixture of (r)- and (s)-3-bromo-3-methylhexane where the (s) stereoisomer would predominate (r)-3-bromo-3-methylhexane a racemic mixture of (r)- and (s)-3-bromo-3-methylhexane

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a racemic mixture of (R)- and (S)-3-bromo-3-methylhexane

Explanation: -

In free radical halogenation, the radical intermediate formed is sp2 hybridization with a trigonal planar geometry.

Thus attack of the bromine can occur from both the top direction as well as the down direction that is from either side of the molecule.

Thus when when (r)-3-methylhexane reacts with bromine in the presence of light, a racemic mixture of (R)- and (S)-3-bromo-3-methylhexane