Which of the following is not true about ${\mathrm{CHCl}}_3$

${\mathrm{CHCl}}_3+\frac{1}{2}{\mathrm{O}}_2\left(\text{air}\right)\stackrel{\text{Sunlight}}{\to }\underset{\left(\text{toxic}\right)}{{\mathrm{COCl}}_2}+\mathrm{HCl}$

${\mathrm{CHCl}}_3$ when exposed to air & sunlight forms toxic $\underset{\left(\text{phosgene}\right)}{{\mathrm{COCl}}_2}$

$\therefore$ option (1) must be the precaution taken

option (2) prevention 

$2{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}+{\mathrm{COCl}}_2\to {\left({\mathrm{C}}_2{\mathrm{H}}_5\right)}_2{\mathrm{CO}}_3+2\mathrm{HCl}$ (or) ${\left({\mathrm{C}}_2{\mathrm{H}}_5\mathrm{O}\right)}_2\mathrm{CO}$

Impure ${\mathrm{CHCl}}_3$ produces ${\mathrm{COCl}}_2 \& \mathrm{HCl}$

$\mathrm{HCl}(\mathrm{aq}.)$  is a strong electrolyte

$\mathrm{HCl}\left(\mathrm{aq}.\right)\to {\mathrm{H}}^{+}+{\mathrm{Cl}}^{-}$

The ${\mathrm{Cl}}^{-}$ ion liberated by HCl given ppt with ${\mathrm{AgNO}}_3$

${\mathrm{COCl}}_2$ doesn't react with ${\mathrm{AgNO}}_3$