Assertion :When $C H_{3} - C H_{2} - C H_{2} - C H (B r) - C H_{3}$ is treated with potassium tert-butoxide $C H_{3} - C H_{2} - C H_{2} - C H = C H_{2}$ is formed. Reason: The above reaction is $E_{2}$ .

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$C H_{3} - C H_{2} - C H_{2} - C H (B r) - C H_{3} (C H_{3})_{3} C O K - ------- \to C H_{3} - C H_{2} - C H_{2} - C H = C H_{2} + (C H_{3})_{3} C - O H + K B r$
This is the Hoffmann product formed due to steric hinderance. This elimination follows second order kinetics $(E_{2})$ .

Hence option $A$ is correct.

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