Give the structures of A, B and C in the following reactions:
(i) `CH_(3)CH_(2)Ioverset(NaCN)rarrAunderset("Partial h ydrolysis")overset(OH^(-))rarrBoverset(NaOH+Br_(2))rarrC`
(ii) `C_(6)H_(5)N_(2)Cloverset(CuCN)rarrAoverset(H_(2)"O"//H^(+))rarrBunderset(Delta)overset(NH_(3))rarrC`
(iii) `CH_(3)CH_(2)Broverset(KCN)rarrAoverset(LiAlH_4)rarrBunderset(0^@C)overset(HNO_2)rarrC`
(iv) `C_(6)H_(5)NO_2overset(Fe//HCl)rarrAoverset(NaNO_(2)+HCl)underset(273 K)rarrBoverset(H_(2)"O"//H^(+))underset(Delta)rarrC`
(v) `CH_(3)COOHoverset(NH_(3))underset(Delta)rarrAoverset(NaOBr)rarrBoverset(NaNO_(2)//HCl)rarrC`
(vi) `C_(6)H_(5)NO_(2)overset(Fe//HCl)rarrAunderset(273K)overset(HNO_(2))rarrBoverset(C_(6)H_(5)OH)rarrC`

Explanation

To solve the given reactions step by step, let's analyze each part of the question one by one.

### (i) Reaction:
**`CH3CH2I + NaCN → A → B (Partial Hydrolysis) → C (NaOH + Br2)`**

**Step 1:** React `CH3CH2I` with `NaCN`.
- **Reaction:** This is a nucleophilic substitution reaction where the cyanide ion (CN⁻) attacks the carbon attached to iodine (I), displacing it.
- **Product A:** `CH3CH2CN` (Ethyl cyanide or propionitrile).
...