Give the structures of A, B and C in the following reactions
(i) `CH_(3)CH_(2)I overset(NaCN)(to) A underset("hydrolysis Partial")overset(OH^(-))(to) B overset(NaOH+Br_(2))to C`
(ii) `C_(6)H_(5)N_(2)Cl overset(CuCN)to A overset(H_(2)O // H^(+))(to) B underset(Delta)overset(NH_(3))(to) C`
(iii) `CH_(3)CH_(2)Br overset(KCN)to A overset(LiAlH_(4))to B underset(0^(@)C)overset(HNO_(2))to C` (iv) `C_(6)H_(5)NO_(2) overset(Fe//HCl)to A underset(273 K)overset(NaNO_(2)+HCl)to B underset(Delta)overset(H_(2)O // H^(+))to C`
(v) `CH_(3)COOH underset(Delta)overset(NH_(3))to A overset(NaOBr)to B overset(NaNO_(2)//HCl)to C`
(vi) `C_(6)H_(5)NO_(2) overset(Fe//HCl)to A underset(273 K)overset(HNO_(2))to B overset(C_(6)H_(5)OH)to C`

Explanation

Let's break down the reactions step by step to find the structures of A, B, and C for each reaction.

### (i) Reaction: `CH3CH2I overset(NaCN)(to) A underset("hydrolysis Partial")overset(OH^(-))(to) B overset(NaOH+Br2)to C`

1. **Starting Material**: `CH3CH2I` (ethyl iodide).
2. **Reaction with NaCN**:
- The cyanide ion (CN⁻) acts as a nucleophile and performs a nucleophilic substitution on the ethyl iodide.
- **Product A**: `CH3CH2CN` (propionitrile).
...