Assertion :2-Butanol on heating with $H_{2} S O_{4}$ gives 1-butene and 2-butene. Reason: Dehydration of 2-butanol follows Saytzeff rule.

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
In the dehydration of secondary and tertiary alcohols, when there is a possibility of the formation of two isomers. The hydrogen atom is preferentially eliminated from the adjacent carbon atom with the fewer number of hydrogen atoms. This is Saytzeff’s rule.

$C H_{3} - C H_{2} - H | C | O H - C H_{3} 60 % H_{2} S O_{4} - ------ \to 10^{o} C C H_{3} C H_{2} C H = 1 - b u t e n e (20 %) C H_{2} + C H_{3} C H = C H 2 - b u t e n e (80 %) C H_{3}$

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Similar questions

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(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.