A) \[~-OH >-OR\left( order of -l effect \right)\]
B) \[-C{{H}_{3}} > C{{O}_{3}} > CC{{l}_{3}} \left( order of +l power \right)\]
C) \[-F> -OH > -N{{H}_{2}} \left( order of -l effect \right)\]
D) \[-NO - S{{O}_{2}}R - S{{O}_{3}}H - N{{O}_{2}} \left( set of\,\,meta\,\,directors \right)\]
Correct Answer: C
Solution :
Problem is based on concept of Inductive effect and electronegativity of element. As F is most electronegative element with smallest size rather than ?OH and \[N{{H}_{2}}\] where O and N has larger size as well as lower electronegative than F. \[\,F~~~\,\,\,OH~\,\,\,~~N{{H}_{2}}\] Electronegativity decreases. \[\to \] Inductive effect decreases. \[\to \] Hence, correct order is [c]. While all other are conceptually very wrong.
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