CH_3-CH=CH_2 xrightarrow{Br_2, hv (text{low c | vedclass

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Question

(B) The reaction sequence is as follows:$1.$ Allylic bromination of propene with $Br_2$ at low concentration and $hv$ gives allyl bromide: $CH_3-CH=CH

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$CH_2=CH-CH=C(CH_3)_2$

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(B) The reaction sequence is as follows:$1.$ Allylic bromination of propene with $Br_2$ at low concentration and $hv$ gives allyl bromide: $CH_3-CH=CH_2 \xrightarrow{Br_2, hv} CH_2=CH-CH_2Br$.$2.$ Reaction with $Mg$ in dry ether forms the Grignard reagent: $CH_2=CH-CH_2Br \xrightarrow{Mg, 	ext{ether}} CH_2=CH-CH_2MgBr$.$3.$ Nucleophilic addition of the Grignard reagent to acetone followed by hydrolysis with $NH_4Cl$ gives $2-	ext{methylpent-}4-	ext{en-}2-	ext{ol}$: $CH_2=CH-CH_2MgBr + CH_3-CO-CH_3 \xrightarrow{NH_4Cl} CH_2=CH-CH_2-C(OH)(CH_3)_2$.$4.$ Acid-catalyzed dehydration $(H^{+}, \Delta)$ of the alcohol produces the more stable conjugated diene,$2-	ext{methylpenta-}1,3-	ext{diene}$,as the major product $(X)$: $CH_2=CH-CH_2-C(OH)(CH_3)_2 \xrightarrow{H^{+}, \Delta} CH_2=CH-CH=C(CH_3)_2$.

$CH_3-CH=CH_2$ $\xrightarrow{Br_2, hv (\text{low conc.})} \dots$ $\xrightarrow{Mg, \text{Dry ether}} \dots$ $\xrightarrow{CH_3-CO-CH_3, NH_4Cl} \dots$ $\xrightarrow{H^{+}, \Delta} (X)$. The end product $(X)$ of the above reaction is:

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