Chemistry - GOC Question with Solution | TestHub

$\mathrm{C}-\mathrm{C}\mathrm{l}$bond length of these compounds in decreasing order is as follows
$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}\mathrm{l}>\mathrm{C}{\mathrm{H}}_2=\mathrm{C}\mathrm{H}-\mathrm{C}\mathrm{l}>{\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{C}\mathrm{l}$
$\text{C}-\text{Cl}\text{bond}\text{length}\text{=}\frac{\text{1}}{\text{no}\text{.}\text{of}\text{resonating}\text{structures}}$
$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}\mathrm{l}$no conjugation
$\mathrm{C}{\mathrm{H}}_2=\mathrm{C}\mathrm{H}-\mathrm{C}\mathrm{l}$Two resonating structures
${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{C}\mathrm{l}$Four resonating structures