The reagent used for the dehydration of an alcohol is

Identify the final product in the following reaction sequence: $CH \equiv CH$ $\xrightarrow[H_2SO_4]{HgSO_4}$ $\xrightarrow[H_2O]{CH_3MgBr}$ $\xrightarrow{P/Br_2}$

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

$Ph-CH=CH-CH_3$ $\xrightarrow[H_2O_2/OH^-]{B_2H_6/THF}$ Products. Reaction $(A)$
$CH_3-CH=CH-Ph$ $\xrightarrow[NaBH_4]{Hg(OAc)_2/H_2O}$ Products. Reaction $(B)$
Which statement is correct?

The product of the reaction is:

Which of the following is a tertiary allylic alcohol?