$C_2H_5MgI$ reacts with $HCHO$ to form the final product.

Which of the following reaction sequences would be the best for the synthesis of $t$-butyl alcohol?

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

Propan-$1$-ol can be prepared from propene by:

Show how the following alcohols can be prepared by the reaction of a suitable Grignard reagent with methanal:
$(i)$ $C_6H_5CH_2OH$
$(ii)$ $CH_3CH_2CH(CH_3)CH_2OH$

The oxymercuration-demercuration of allylbenzene $(C_6H_5-CH_2-CH=CH_2)$ produces the major product: