Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The concept of resonance explain various properties of compounds. The molecules with conjugated systems of π bonds are stabilised by resonance and have low heat of hydrogenation. Hyper conjugative stabilisation also decreases heat of hydrogenation. In aromatic rings a functional group with a lone pair exerts +M effect.
(i) The correct order of heat of hydrogenation –
(p) 1,3-pentadiene
(q) 1,3-butadiene
(r) 2, 3-dimethyl-1,3-butadiene
(s) propadiene
Correct Answers for Comprehension Sub-Questions
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i)
Sol. s > q > p > r
(ii)
Sol. H 2 
= CH – CH = CH – 
– CH 3
(iii)
Sol. 
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