Match List-I with List-II
|
List-I (IUPAC name) |
List-II (Common name) |
|
(A) 2,4,6-Trinitrophenol |
(I) Resorcinol |
|
(B) Benzene-1,4-diol |
(II) Quinol |
|
(C) Benzene-1,3-diol |
(III) o-Cresol |
|
(D) 2-methyl phenol |
(IV) Picric acid |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
Many phenols are better known by their common names than by their IUPAC names. The IUPAC name gives the substituents and their positions on the benzene ring, with the –OH carbon as C1 in phenols; the dihydroxybenzenes are named as benzenediols.
(A) 2,4,6-Trinitrophenol — This matches (IV) Picric acid. Phenol with nitro groups at both ortho positions and the para position is a strong acid, because the three –\( \ce{NO2} \) groups withdraw electrons from the ring.
(B) Benzene-1,4-diol — This matches (II) Quinol. The two –OH groups are para to each other; it is also called hydroquinone.
(C) Benzene-1,3-diol — This matches (I) Resorcinol. The two –OH groups are meta to each other (the 1,2-isomer is catechol).
(D) 2-methyl phenol — This matches (III) o-Cresol. The methylphenols are the cresols; with \( \ce{CH3} \) next to –OH it is the ortho isomer.
Shortcut: (A)-(IV) appears only in Option (1).
NCERT (2026-27 edition):
Nomenclature – …
Chemical Reactions – “Nowadays picric acid is prepared by treating phenol first with concentrated sulphuric acid which converts it to phenol-2,4-disulphonic acid, and then with concentrated nitric acid to get 2,4,6-trinitrophenol.”