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Aldehydes Ketones and Carboxylic Acids question

2002 · Shift 0 · Q29
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Aldehydes Ketones and Carboxylic Acids question

2002 · Shift 0 · Q29

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
Picric acid is :
  1. A
    AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 225 English Option 1
  2. B
    AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 225 English Option 2
  3. C
    AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 225 English Option 3
  4. D
    AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 225 English Option 4
View written solutionFree

Correct answer: C

  1. Identify picric acid

Picric acid is the common name of 2,4,62,4,62,4,6-trinitrophenol.

Its structure is:

Phenol ring with −OH at position 1 and −NO2 groups at 2,4,6\text{Phenol ring with } -OH \text{ at position 1 and } -NO_2 \text{ groups at } 2,4,6Phenol ring with −OH at position 1 and −NO2​ groups at 2,4,6
  1. Reason

Phenol itself is weakly acidic, but in picric acid there are three strongly electron-withdrawing nitro groups (−NO2)(-NO_2)(−NO2​) attached to the benzene ring.

These nitro groups:

  • withdraw electron density by the −I-I−I effect,
  • stabilize the picrate ion formed after loss of H+H^+H+.

Hence picric acid is a strong acidic phenol compared with ordinary phenol.

  1. Standard identity

Therefore, picric acid is:

2,4,6-trinitrophenol\boxed{2,4,6\text{-trinitrophenol}}2,4,6-trinitrophenol​
  1. Match with options

Since the stored correct answer is C, option C must correspond to 2,4,62,4,62,4,6-trinitrophenol.

So the correct answer is:

C\boxed{C}C​
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