The correct sequence of correct reagents for the following transformation is :-
Question:

The correct sequence of correct reagents for the following transformation is :-

1. (i) $\mathrm{Fe}, \mathrm{HCl}$

(ii) $\mathrm{Cl}_{2}, \mathrm{HCl}$,

(iii) $\mathrm{NaNO}_{2}, \mathrm{HCl}, 0^{\circ} \mathrm{C}$

(iv) $\mathrm{H}_{2} \mathrm{O} / \mathrm{H}^{+}$

2. (i) $\mathrm{Fe}, \mathrm{HCl}$

(ii) $\mathrm{NaNO}_{2}, \mathrm{HCl}, 0^{\circ} \mathrm{C}$

(iii) $\mathrm{H}_{2} \mathrm{O} / \mathrm{H}^{+}$

(iv) $\mathrm{Cl}_{2}, \mathrm{FeCl}_{3}$

3. (i) $\mathrm{Cl}_{2}, \mathrm{FeCl}_{3}$

(ii) $\mathrm{Fe}, \mathrm{HCl}$

(iii) $\mathrm{NaNO}_{2}, \mathrm{HCl}, 0^{\circ} \mathrm{C}$

(iv) $\mathrm{H}_{2} \mathrm{O} / \mathrm{H}^{+}$

4. (i) $\mathrm{Cl}_{2}, \mathrm{FeCl}_{3}$

(ii) $\mathrm{NaNO}_{2}, \mathrm{HCl}, 0^{\circ} \mathrm{C}$

(iii) $\mathrm{Fe}, \mathrm{HCl}$

(iv) $\mathrm{H}_{2} \mathrm{O} / \mathrm{H}^{+}$

Correct Option: , 3

Solution: