Electrochemistry — Chemistry STD 12 Science — Question

$(A)$ $\mathrm{Bi}_2 \mathrm{O}_5$ is more basic than $\mathrm{N}_2 \mathrm{O}_5$

$(B)$ $\mathrm{NF}_3$ is more covalent than $\mathrm{BiF}_3$

$(C)$ $\mathrm{PH}_3$ boils at lower temperature than $\mathrm{NH}_3$

$(D)$ The $\mathrm{N}-\mathrm{N}$ single bond is stronger than the $P-P$ single bond

$(i)$ $PtCl _{4} . 5 NH _{3}$   $(ii)$ $PtCl _{4} . 4 NH _{3}$   $(iii)$ $PtCl _{4} . 3 NH _{3}$   $(iv)$ $PtCl _{4}. 2 NH _{3}$

Follow the order

$CH_3CH_2CH_2Br + NaCN \to $$CH_3CH_2CH_2CN+ NaBr$

This reaction will be the fastest in