The appropriate sequence of reactions for obtaining 2-phenylbutanoic acid from benzene is

(i) 1-chlorobutane/$$\text{AlCl}_3$$ (ii) limited $$\text{Cl}_2$$, light (iii) aq NaCN (iv) $$\text{H}^+$$, $$\text{H}_2\text{O}$$, heat

(i) 2-chlorobutane/$$\text{AlCl}_3$$ (ii) $$\text{K}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4$$

(i) propanoyl chloride/$$\text{AlCl}_3$$ (ii) Zn-Hg/HCl (iii) limited $$\text{Cl}_2$$, light (iv) aq. NaCN (v) $$\text{H}^+$$, $$\text{H}_2\text{O}$$, heat

(i) butanoyl chloride/$$\text{AlCl}_3$$ (ii) $$\text{NaBH}_4$$ (iii) CuCN (iv) $$\text{H}^+$$, $$\text{H}_2\text{O}$$, heat