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Assertion $A$ : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.
Reason $R$ : Phenols react with halogen acids violently. In the light of the above statements, choose the most appropriate from the options given below:
$(I)\,\, O_3 \to $ product
$(II)\,\,C{r_2}O_7^{ - 2}\xrightarrow{{{H^ + }}}$ product
$(III)\,\,MnO_4^\Theta \xrightarrow{{{H^ + }}}$ product
$(IV)\,\, H_2S \to $ product
| Column $I$ | Column $II$ |
| $(a) \ K_b$ | $(i)$ Elevation in boiling point |
| $(b) \ K_f$ | $(ii)$ Van't Hoff factor |
| $(c) \ i$ | $(iii)$ Cryoscopic constant |
| $(iv)$ Ebullioscopic constant |