Question:
Which of the following has the shortest $\mathrm{C}-\mathrm{Cl}$ bond?
Correct Option: , 2
Solution:
In $\mathrm{Cl}-\mathrm{CH}=\mathrm{CH}-\mathrm{NO}_{2}$ double bond character in carbon-chlorine bond is maximum due to resonance and so the bond length is shortest.