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Preparation of Carboxylic Acids

12. ASSERTION...

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12. ASSERTION REASON A: Phenol forms 2,4,6-tribromophenol on treatment with Br2 water at 273 K. R: Phenol is o,p-directing group.

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Q. Assertion :Phenol forms 2,4,6-tribromophenol on treatment with

B r_{2}

water at 273 K. Reason: Phenol is o,p-directing group.

Q. Assertion :Phenol forms 2,4,6-tribromophenol on treatment with

{B r}_{2}

in carbon disulphide at

273 K

. Reason: Bromine polarises in carbon disulphide.

Q. Assertion :With

B r_{2} - H_{2} O

, phenol give s 2,4,6- tribromophenol but with

B r - C S_{2}

, it gives 4-bromophenol as the major product.
Reason: In water ionization of phenol is enhanced but in

C S_{2}

, it is greatly suppressed.

Read the above assertion and reason and choose the correct option regarding it.

Q. Assertion :Phenols give

o -

p -

nitrophenol on nitration with concentrated

H N O_{3}

H_{2} S O_{4}

mixture. Reason:

- O H

group in phenol is

o - p -

Q. Name the reagent used for Bromination of phenol to 2,4,6-tribromophenol :

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