Among the following compounds, which one has the shortest

Question:

Among the following compounds, which one has the shortest $\mathrm{C}-\mathrm{Cl}$ bond?


Correct Option: , 4

Solution:

Due to conjugation of lonepair of $\mathrm{Cl}$ with $\pi$ bond, partial double bond character decreases bond length that's why compound (d) has shortest $\mathrm{C}-\mathrm{Cl}$ bond length.

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