Chemistry - GOC Question with Solution | TestHub
List - I | List - II |
|---|---|
(P)
| (1) (i) Compound has more heat of hydrogenation than (ii) |
(Q)
| (2) (i) compound has more resonance energy than (ii) compound |
(R)
| (3) (i) compound is more stable than (ii) |
(S)
| (4) (ii) compound has more heat of hydrogenation than (i) |
| (5) (ii) compound has more degree of unsaturation than (i) |
Options:
Answer:
Solution:
(P) 1: Anthracene (i) is less stable than its isomer phenanthrene (ii), so (i) releases more energy and has a higher heat of hydrogenation than (ii).
(Q) 1: Compound (i) has less aromatic resonance stabilization compared to (ii), which gives (i) a higher heat of hydrogenation.
(R) 2, 3, 4: Compound (ii) contains a more stable conjugated aromatic system, meaning (ii) has higher resonance energy and greater stability, while (i) is less stable and thus has a higher heat of hydrogenation than (ii).
(S) 4, 5: Dewar benzene (ii) is a highly strained bicyclic isomer of benzene (i), meaning (ii) has a higher heat of hydrogenation and a higher degree of unsaturation due to its bridged structure.
