Which of the following compounds has difficulty in breaking the $\mathrm{C}-\mathrm{Cl}$ bond?
Which of the following compounds has difficulty in breaking the $\mathrm{C}-\mathrm{Cl}$ bond?
o-Nitrochlorobenzene
m-Nitrochlorobenzene
p-Nitrochlorobenzene
2,4,6 -trinitrochlorobenzene
Solution
Greater the number of electron withdrawing groups at o/p position, greater is the reactivity of haloarenes towards substitution of halogen atom.
Electron withdrawing group at meta position has practically no effect on reactivity. Hence breaking the $\mathrm{C}-\mathrm{Cl}$ bond is the most difficult in m -nitrochlorobenzene.