In which reaction, product (major) formation takes by Hofmann rule?I) CH3−CH2CHBr−CH3→CH33COK/ΔII) CH3−CH2−CH|F−CH3→alc KOHΔIII) CH3−CH2−CH|Br−CH3→ CH3ONa/ΔSelect the correct answer from the codes Given below:

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In which reaction, product (major) formation takes by Hofmann rule?

I) $C H_{3} - C H_{2} C H B r - C H_{3} \overset{{(C H_{3})}_{3} C O K / Δ}{\to}$

II) $C H_{3} - C H_{2} - \overset{\overset{F}{|}}{C H} - C H_{3} \to_{a l c K O H}^{Δ}$

III) $C H_{3} - C H_{2} - \overset{\overset{B r}{|}}{C H} - C H_{3} \to_{}^{C H_{3} O N a / Δ}$

Select the correct answer from the codes Given below:

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I, II and III

II and III only

I only

I and II only

answer is B.

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Detailed Solution

I and II ----- Hofmann product ; III---Saytzeff product

In reaction I, bulky base favors Hofmann product.

In reaction II, F is not a good leaving group and the reactant undergoes E₁CB mechanism to form a carbanion intermediate, resulting in the formation of Hofmann product.

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