MCQ
The following reaction is


- ✓Nucleophilic substitution
- BElectrophilic substitution
- CFree radical substitution
- DNone of these

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$Z{n^{2 + }} + 2{e^ - } \to Zn$ ; $E = - 7.62\,\,V,$
$F{e^{2 + }} + 2{e^ - } \to Fe$ ; $E = - 7.81\,\,V$
The emf of the cell $F{e^{2 + }} + Zn \to Z{n^{2 + }} + Fe$ is ............ $\mathrm{V}$
$(i)$ $A$ and $D$ both form blue-violet colour with ninhydrin.
$(ii)$ Lassaigne extract of $\mathrm{C}$ give positive $\mathrm{AgNO}_{3}$ test and negative $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ test.
$(iii)$ Lassaigne extract of $\mathrm{B}$ and D gives positive sodium nitroprusside test
Based on these observations which option is correct ?

