Give chemical equations and name the main product formed when
(i) Ethyl alcohol is mixed with air and passed over Ag catalyst at 520 K.
(ii) Benzoyl chloride is treated with lithium tri-tert-butoxy aluminium hydride.
(iii) Isoprophlidene chloride is treated with caustic potash.
(iv) Methylmagnesium iodide is treated with HCN and the resultant product is hydrolysed.

Explanation

### Step-by-Step Solution:

#### (i) Ethyl alcohol mixed with air and passed over Ag catalyst at 520 K

1. **Identify the reactants**: Ethyl alcohol (C2H5OH) is mixed with air, which contains oxygen.
2. **Write the reaction**: Ethyl alcohol undergoes oxidation in the presence of silver catalyst (Ag) at 520 K.
\[
\text{C}_2\text{H}_5\text{OH} + \text{O}_2 \xrightarrow{\text{Ag}, 520 \text{ K}} \text{C}_2\text{H}_4\text{O} + \text{H}_2\text{O}
...