Assertion :Treatment of $2$ -methyl- $2$ -pentene with NBS in $C C I_{4}$ gives $4$ -bromo- $2$ -methyl- $2$ -pentene as major product. Reason: NBS brings about free radical abomination at acrylic position.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Assertion - Treatment of 2-methyl-2-pentene with NBS in $C C I_{4}$ gives $4$ -bromo- $2$ -methyl- $2$ -pentene as major product. Thus Assertion is false as rearrangement of radical gives $4$ -bromo- $4$ -methyl- $2$ -pentene as a major product as shown in above mechanism. Rearrangement takes place because free radical is more stable at tertiary carbon. So assertion is not correct.

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Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.