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Nuclear Fission

Which of the ...

Question

Which of the following compound(s) on reaction with $B r_{2} / h ν$ give a $3^{\circ}$ halide as a major product?

A

Cyclopentane

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B

Methylcyclopentane

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C

Cyclohexane

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D

3-methylpentane

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Solution

The correct option is D 3-methylpentane
Stability of free radical :
$3^{\circ} > 2^{\circ} > 1^{\circ}$

In (a) , only $2^{\circ}$ halide is formed as shown :

In (b) , major product that is formed is a $3^{\circ}$ halide as shown :

In (c), major product that is formed is a $2^{\circ}$ halide as shown :

In (d), major product that is formed is a $3^{\circ}$ halide as shown :

$∴$ correct options are (b) and (d)

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