Assertion (A): Reaction of but-1-ene with HBr | vedclass

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(D) According to Markownikoff's rule,the addition of reagents such as $HX$ to unsymmetrical alkenes occurs in such a way that the negative part of the

Vedclass · Accepted Answer

$A$ is not correct but $R$ is correct

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(D) According to Markownikoff's rule,the addition of reagents such as $HX$ to unsymmetrical alkenes occurs in such a way that the negative part of the adding molecule attaches to the carbon atom of the double bond which carries the lesser number of hydrogen atoms.For the reaction of but$-1-$ene $(CH_3CH_2CH=CH_2)$ with $HBr$,the major product is $2-$bromobutane $(CH_3CH_2CH(Br)CH_3)$,not $1-$bromobutane $(CH_3CH_2CH_2CH_2Br)$.Therefore,the assertion $(A)$ is incorrect because it states $1-$bromobutane is the major product.The reason $(R)$ is correct as it correctly states the rule governing the addition of hydrogen halides to alkenes.Thus,$A$ is incorrect and $R$ is correct.

Assertion $(A)$: Reaction of but$-1-$ene with $HBr$ gives $1-$bromobutane as major product.
Reason $(R)$: Addition of hydrogen halides to alkenes proceeds according to Markownikoff's rule.
The correct answer is

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Assertion $(A)$: Reaction of but$-1-$ene with $HBr$ gives $1-$bromobutane as major product.Reason $(R)$: Addition of hydrogen halides to alkenes proceeds according to Markownikoff's rule.The correct answer is