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Curtius and Hofmann Rearrangements

Which of the ...

Question

Which of the following will not give Hoffmann bromide reaction?

A

C H_{3} - O | | C - N H_{2}

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B

P h - O | | C - N H_{2}

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C

C H_{3} - O | | C - N H - B r

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D

P h - O | | C - N H - P h

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Solution

The correct option is B $P h - O | | C - N H - P h$
$P h - O | | C - N H - P h secondary amide B r_{2} / N a O H - ------ \to No reaction$

Hoffmann bromide reaction $:$
The above mentioned compound is not primary amide but a secondary amide $.$ The reaction takes place by a formation of iso cyanide which will not take place in the reaction $.$ Hence it does not react or give a primary amine $.$
Option D is the answer.

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Q. The order or reactivity of phenyl magnesium bromide with the following compounds is:

C H_{3} - O | | C - C H_{3}

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The correct order of the basicities of the following compounds is:

P h - O H | C H - C H_{3} P C C \to (A) N H_{2} - N H - O | | C - N H_{2} ⟶ (B)

Product (B) is?

Which of the following is not correct?

$O r d e r o f b a s i c i t y O r d e r o f n u c l e o p h i l i c i t y (a) F^{-} > C l^{-} > B r^{-} B r_{-} > C l^{-} > F^{-} (b) H - O - O^{-} > O H^{-} H - O - O^{-} > O H^{-} (c) C H_{3} > N H_{2}^{-} > O H - C H_{3} > N H_{2}^{-} > O H^{-} (d) H_{2} O > H_{2} S H_{2} O < H_{2} S$

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Curtius and Hofmann Rearrangements

Standard XII Chemistry

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