$A$ solution of optically active $1$-phenylethanol racemizes in acidified aqueous medium. It is due to

Order of reactivity of alcohols towards sodium metal is

What is the final product $(IV)$ in the following reaction sequence? $CH_3-CH(OH)-CH_3$ $\xrightarrow{PBr_3} I$ $\xrightarrow{Mg/ether} II$ $\xrightarrow{\text{Ethylene oxide}} III$ $\xrightarrow{H_2O} IV$

Write the main product of the given reactions:
$1$. $(CH_3)_2CHCHBrCH_3 \xrightarrow[ethanol]{KOH, \Delta }$
$2$. $(CH_3)_2CHCH(OH)CH_3 \xrightarrow{H_2SO_4, \Delta }$

What is the product '$A$' in the following reaction?
(Image of an epoxide ring fused to a cyclopentane ring with an exocyclic double bond,reacting with $H_3O^{\oplus}$ to form $A$.)

Which is the best reagent to convert isopropyl alcohol to isopropyl bromide?
$CH_3-CH(OH)-CH_3 \xrightarrow{?} CH_3-CH(Br)-CH_3$