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Phenol is converted by concentrated nitr...

Phenol is converted by concentrated nitric acid into

A

salicaylic acid

B

citric acid

C

tartaric acid

D

picric acid

Text Solution

Verified by Experts

The correct Answer is:
C

The yield of picric acid is poor due to large losses by oxidation. Picric acid is prepared commecially by first sulphonating phenol and then nitrating the products. Another commercially method is as follows:

The presence of the nitro-group protects to a large extent, the hydroxyl group from oxidation. It is in the nitration of phenol to the `o-`and `p-`nitrophenol that the loss by oxidation is greatest
Picric acid can be obtained in the laboratory by oxidising `1,3,5,-`trinitrobenzene with potassium ferricyanide.
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Knowledge Check

  • When tin is treated with concentrated nitric acid

    A
    It is converted into stannous nitrate
    B
    It is coverted into stannic nitrate
    C
    It is converted into metestannic acid
    D
    It becomes passive

  • Phenol is heated with concentrated sulphuric acid at 110^(@)C . The major product formed is

    A
    `4-`hydroxybenzensulphonic acid
    B
    `3-`hydroxybezenesulphonic acid
    C
    `2-`hydroxybenzenesulphonic acid
    D
    a mixture of all these in equal amounts

  • The acid formed, when iodine reacts with concentrated nitric acid, is

    A
    iodic acid
    B
    nitrous acid
    C
    hydroiodic acid
    D
    per-iodic acid.

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