$(i)$ મિથાઇલએમાઈન $(ii)$ ફોસ્જિન
$(iii)$ ફોસ્ફિન $(iv)$ ડાયમિથાઇલએમાઈન
$CH_3NH_2 + COCl_2$ $\xrightarrow{{ - HCl}}$ [$CH_3NH -CO -Cl$] $\mathop {\xrightarrow{\Delta }}\limits_{ - HCl} $ $CH_3 -N = C = O$

$A$ શોધો

(image) $\xrightarrow{{SOC{l_2}}}\,B\,\xrightarrow{{N{H_3}}}\,C$$\,\xrightarrow[{B{r_2}}]{{NaOH}}\,D$