What is the product formed when formaldehyde reacts with methyl magnesium bromide?

Show how will you synthesize:
$(i)$ $1-$phenylethanol from a suitable alkene.
$(ii)$ cyclohexylmethanol using an alkyl halide by an $S_{N}2$ reaction.
$(iii)$ pentan$-1-$ol using a suitable alkyl halide?

The possible final products $R$ and $S$ of the following reaction sequence are:

In which of the following reactions does the addition of $H_2O$ take place according to Markovnikov's rule but without rearrangement?

Preparation of alcohols from alkenes involves the electrophilic attack on alkene carbon. Explain its mechanism.

What is compound $D$ in the following sequence of reactions?
$CH_3CH_2OH$ $\xrightarrow{P + I_2} A$ $\xrightarrow{Mg, \text{ether}} B$ $\xrightarrow{HCHO} C$ $\xrightarrow{H_2O} D$