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  4. The major product obtained in the photo catalysed bromination of 2-methylbutane is :

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Q. The major product obtained in the photo catalysed bromination of $2$-methylbutane is :

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Solution:

$CH_3- \overset{\underset{|}{C}H_3}{C}H-CH_2 -CH_3 \xrightarrow{Br_2/hv}\underset{\text{(Major product)}}{CH_3 - \underset{\overset{|}{B}r}{\overset{\underset{|}{C}H_3}{C}} - CH_2-CH_3}$
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relatively ratio for bromination is
$1^{\circ} : 2^{\circ} : 3^{\circ} : : 1 : 82 : 1600$
Hence $3^{\circ}$ product will be major product