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$1.$ Which one of the following reagents is used in the above reaction?
$(A)$ aq. $\mathrm{NaOH}+\mathrm{CH}_3 \mathrm{Cl}$
$(B)$ aq. $\mathrm{NaOH}+\mathrm{CH}_2 \mathrm{Cl}_2$
$(C)$ aq. $\mathrm{NaOH}+\mathrm{CHCl}_3$
$(D)$ aq. $\mathrm{NaOH}+\mathrm{CCl}_4$
$2.$ The electrophile in this reaction is
$(A)$ : $\mathrm{CHCl}$ $(B)$ ${ }^{+} \mathrm{CHCl}_2$
$(C)$ $\mathrm{CCl}_2$ $(D)$. $\mathrm{CCl}_3$
$3.$ The structure of the intermediate $I$ is
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Give the answer question $1, 2$ and $3.$
Assume Planck's constant $( h )=6.4 \times 10^{-34}\,Js$ Speed of light $( c )=3.0 \times 10^8\,m / s$ and Avogadro's constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$
$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$