MCQ
Heavy water freezes at ......... $^oC$.
- A$0$
- ✓$3.8$
- C$38$
- D$ - 0.38$
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Figure $\xrightarrow[{pyridine}]{{C{H_3}COCl}}$ $P$ $\xrightarrow[{C{H_3}COOH}]{{B{r_2}}}Q\,\xrightarrow{{{H_3}{O^ + }}}R$
${{C}_{2}}{{H}_{5}}N{{H}_{2}} \xrightarrow{HN{{O}_{2}}}A \xrightarrow{PC{{l}_{5}}}B \xrightarrow{H.N{{H}_{2}}}C$

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:
