(i) $\mathrm{KMnO}_{4}$, (ii) $\mathrm{Br}_{2} / \mathrm{Fe}$, (iii) $\mathrm{Fe} / \mathrm{H}^{+}$, (iv) $\mathrm{Cl}_{2}$

(i) $\mathrm{Fe} / \mathrm{H}^{+}$, (ii) $\mathrm{HONO}$, (iii) $\mathrm{CuCl}$, (iv) $\mathrm{KMnO}_4$, (v) $\mathrm{Br}_2$

(i) $\mathrm{Br}_{2} / \mathrm{Fe}$, (ii) $\mathrm{Fe} / \mathrm{H}^{+}$, (iii) $\mathrm{HONO}$, (iv) $\mathrm{CuCl}$, (v) $\mathrm{KMnO}_{4}$

(i) $\mathrm{Br}_{2} / \mathrm{Fe}$, (ii) $\mathrm{Fe} / \mathrm{H}^{+}$, (iii) $\mathrm{KMnO}_{4}$, (iv) $\mathrm{Cl}_{2}$

Butanal and acetaldehyde

Butanoic acid and acetic acid

Butanal and acetic acid

Butanoic acid and acetaldehyde