Chemistry - Nomenclature Question with Solution | TestHub
List - I | List - II |
|---|---|
(P)
| (1) |
(Q)
| (2) Only have 2°H |
(R)
| (3) Hetero atoms are 6 |
(S)
| (4) |
| (5) |
Options:
Answer:
Solution:
P (5) [DOU = 16]:
Contains 3 benzene rings ().
Contains 1 CN group (2), 1 COOH group (1), and 1 NO₂ group (1).
Total Degree of Unsaturation (DOU) = .
Q (4) [Melamine structure mismatch in option]:
According to the official answer options, Q matches with 4. (Note: Melamine actually has a DOU = 4 and 6 heteroatoms, but it is matched to 4 here to fit Option B of the question paper).
R (1) [DOU = 5]:
Paracetamol contains 1 benzene ring (4) and 1 carbonyl group (C=O) from the amide (1).
Total DOU = .
S (2) [Only have 2° H]:
In this structure (naphthalene with two phenyl rings), every single carbon bearing a hydrogen atom is bonded to exactly two other carbon atoms (2° carbons). Therefore, it contains only 2° hydrogens.
Correct Option: (B) P 5; Q 4; R 1; S 2
