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

In order to prepare $1$-chloropropane,which of the following reactants can be employed?

Show how you would synthesize the following alcohols from appropriate alkenes:
$(i)$ $1$-methylcyclohexanol
$(ii)$ $3$-methylhexan-$3$-ol
$(iii)$ pentan-$2$-ol
$(iv)$ $2$-cyclohexylbutan-$2$-ol

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 conversion of $CH_3-CH_2-CHO$ to $CH_3-CH_2-CH(CH_3)-OH$ is achieved by:

Show how the following alcohols are prepared by the reaction of a suitable Grignard reagent with methanal:
$(i)$ $CH_3-CH(CH_3)-CH_2OH$
$(ii)$ Cyclohexylmethanol .