Question
Question: The decreasing order of bond length of C = C bond in the following compounds is: <img src="https://...
The decreasing order of bond length of C = C bond in the following compounds is:
I II III IV
A
II > I > IV > III
B
III > I > II > IV
C
IV > II > I > III
D
IV > I > II > III
Answer
III > I > II > IV
Explanation
Solution
(I) & (III) has delocalisation (III has better delocalisation)
(II) & (IV) has hyperconjugation.
(II has better hyperconjugation).