A) \[p-{{O}_{2}}N-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]
B) \[p-C{{H}_{3}}O-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]
C) \[p-Cl-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]
D) \[{{C}_{6}}{{H}_{5}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]
Correct Answer: B
Solution :
Nitro-group is electron withdrawing therefore decreases stability. 
Methoxy group is electron releasing. Therefore increases stability by donating electron. 
Chlorine is also electron withdrawing but its effect is less than \[-N{{O}_{2}}\] group. Hence, correct order of stability. 
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