$A$ sample of $4.5 \ g$ of an unknown monohydric alcohol,$ROH$,was added to methylmagnesium iodide. $A$ gas is evolved,collected,and its volume is measured to be $3.1 \ L$ at $NTP$. The molecular weight of the unknown alcohol is $g/mol$. [Nearest integer]

$CH_3CH_2CH(OH)CH(CH_3)_2 + CH_3COCl \xrightarrow{\text{base}} CH_3CH_2CH(OCOCH_3)CH(CH_3)_2 + HCl$
In the above reaction,if the reactant alcohol is a pure $R$-isomer,the product would:

Which of the following is a secondary allylic alcohol?

Name the reagents used in the following reactions:
$(i)$ Oxidation of a primary alcohol to carboxylic acid.
$(ii)$ Oxidation of a primary alcohol to aldehyde.
$(iii)$ Bromination of phenol to $2,4,6-$tribromophenol.
$(iv)$ Benzyl alcohol to benzoic acid.
$(v)$ Dehydration of propan$-2-$ol to propene.
$(vi)$ Butan$-2-$one to butan$-2-$ol.

Glycerol reacts with $P_4 + I_2$ to form

Why is sulphuric acid not used during the reaction of alcohols with $KI$?