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Nucleophilic Substitution in Aryl Halides

Bottles conta...

Question

Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They are labelled as A and B. A and B were separately taken in a test tubes and boiled with NaOHsolution.Then in each test tube Dilute HNO₃ and Ag NO₃ was added. Substance B gave a yellow precipitate. Which one of thefollowingstatements is true for this experiment?

A

Addition of HNO₃ was not necessary

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B

A was C₆H₅CH₂I

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C

A was C₆H₅Cl

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D

B was C₆H₅I

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Solution

The correct option is B
A was C₆H₅CH₂I

In chlorobenzene, Cl attached directly to the benzene nucleus. Therefore C-Cl bond acquires double bond character because of resonance and hence Cl in chlorobenzene will not give a yellow ppt of AgI.

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Q. Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They are labelled as A and B. A and B were separately taken in a test tubes and boiled with NaOHsolution.Then in each test tube Dilute HNO₃ and Ag NO₃ was added. Substance B gave a yellow precipitate. Which one of thefollowingstatements is true for this experiment?

Q. Bottles containing

C_{6} H_{5} I

C_{6} H_{5} {C H}_{2} I

lost their original labels. They are labelled A and B for testing. A and B were separately taken in a test tube and boiled with

N a O H

solution. The end solution in each tube was made acidic with dilute

H {N O}_{3}

A g {N O}_{3}

solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment?

Q. Bottles containing

P h I

P h {C H}_{2} I

lost their original labels. They were labelled as

(A)

(B)

(A)

(B)

were separately taken in test tubes and boiled with

N a O H

solutions. The end solution in each tube was made acidic with dilutie

H {N O}_{3}

A g {N O}_{3}

solution was added. Substance

(B)

gave a yellow precipitate. Which of the following statements is true for this experiment?

Q. Bottles containing

C_{6} H_{5} I

C_{6} H_{5} C H_{2} I

lost their original labels. They were labelled A and B for testing A and B were separately taken in test tubes and boiled with NaOH solution. The end solution in each tube was made acidic with dilute

H N O_{3}

A g N O_{3}

solution added. Solution B gave a yellow precipitate. Which one of the following statements is true for the experiment?

Q. 2 mL each of concentrated

HCl, {HNO}_{3}

and a mixture of concentrated

HCl

and concentrated

{HNO}_{3}

in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of gold was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. Give reason why this observation was made.

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Nucleophilic Substitution in Aryl Halides

Standard XI Chemistry

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