Glycerol reacts with $P_4 + I_2$ to form

Identify the product of the following reaction: $CH_3-CH(O)CH_2 \xrightarrow[(ii) H_2O]{(i) CH_3MgBr} ?$

An alcohol $X$ $(C_4H_{10}O)$ does not give turbidity with conc. $HCl$ and $ZnCl_2$ at room temperature. $X$ on reaction with reagent $Y$ gives $Z$. What are $X, Y$ and $Z$ respectively?

The major product obtained by the dehydration of the given alcohol is:

For the given reaction,if the final product is a mixture of $C_4H_8Br_2$ isomers,what is the value of $X$ (the number of alkenes formed in the mixture)?

The conversion of $2-$methylpropan$-1-$ol to $2-$methylpropan$-2-$ol is: