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Nucleophilic Addition at the Carbonyl

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Question

Write chemical equations to illustrate the following name reactions:
(i) Clemmensen's reduction
(ii) Rosenmund's reduction
(iii) HVZ reaction

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Solution

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Clemmensen reduction
R.E.F image
(Rosenmund's reduction)
R.E.F image
Hell-Volhard Zelinsky Reaction

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Q. (a) Account for the following :

(i)

C l - C H_{2} C O O H

is a stronger acid than

C H_{3} C O O H

.

(il) Carboxylic acids do not give reactions of carbonyl group.

(b) Write the chemical equations to illustrate the following name reactions :

(i) Rosenmund reduction

(ii) Cannizzaro's reaction

(c) Out of

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

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

, which gives iodoform test?

Q. (a) Account for the following:
(i)

C H_{3} C H O

is more reactive than

C H_{3} C O C H_{3}

towards reaction with

H C N

.
(ii) Carboxylic acid is a stronger acid than phenol.
(b) Write the chemical equations to illustrate the following name reactions:
(i) Wolff-Kishner reduction
(ii) Aldol condensation
(iii) Cannizzaro reaction

Q. Select the reaction(s) in which

- C = O

group changes to

- C H_{2}

.
A) Clemmensen reduction
B) Wolff-Kishner reduction
C) Aldol condensation
D) Rosenmund reduction

Q. Give balanced equations for the following named reactions:
(i) Reimer-Tiemann reaction
(ii) Rosenmund reaction
(iii) Hoffmann's degradation reaction

Q. Write a chemical reaction to illustration Saytzeff's rule.

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