The fastest rate of reaction will be when $R$ is:

What are $X$ and $Y$ in the following reaction? $R-OH + PCl_5 \rightarrow X + Y + HCl$

Which compounds among the following give a positive iodoform test?

The reaction shown in the image proceeds by the $.......$ mechanism.
$CH_3CH_2CH(OH)CH_3 + SOCl_2 \rightarrow CH_3CH_2CH(Cl)CH_3 + SO_2 + HCl$

How many primary alcohol isomers are there for $C_5H_{11}OH$?

When a Grignard reagent reacts with $(B)$,product $(D)$ is obtained. Reactant $(A)$ of the above reaction is:
$(A)$ $\xrightarrow{PBr_3} (C)$ $\xrightarrow{Mg, \text{ether}} \text{Grignard reagent}$
$(A) \xrightarrow{Na_2Cr_2O_7, H_2SO_4} (B)$
$\text{Grignard reagent} + (B) \to (D) \xrightarrow{H_3O^\oplus} (3,4-\text{dimethylhexan-3-ol})$