Chemistry Alcohols & Phenols SZABMU 2024
PMDC Verified Question 13 of 95
IUPAC name of picric acid is
A
2, 4, 6 tribromophenol
B
2, 4, 6 trinitrotoluene
C
2, 4, 6 trinitrophenol
D
2, 4, 6 trimethylphenol
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 2, 4, 6 trinitrophenol
Concept:

Trivial names (like picric acid) must be mapped to their systematic structural nomenclature.

Formula:

$$ \text{C}_6\text{H}_2(\text{NO}_2)_3\text{OH} $$

Solution:

  • Picric acid is formed by the exhaustive nitration of phenol.


  • The parent chain is phenol (carbon 1 holds the -OH group).


  • Nitro groups (\(-\text{NO}_2\)) are substituted at the two ortho positions (carbons 2 and 6) and the para position (carbon 4).


  • Therefore, the IUPAC name is 2, 4, 6 trinitrophenol.


Why other options are incorrect:

Option B is TNT (an explosive based on toluene, not phenol). Option A is the product of bromination, not nitration.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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