Lower molecular weight alcohols are:

Which of the following alcohols is used in beverages?

The reaction involved in the oil of wintergreen test is salicylic acid + reagent $\xrightarrow[Conc. H_{2}SO_{4}]{\Delta}$ product. The product is treated with $Na_{2}CO_{3}$ solution. The missing reagent in the above reaction is

An optically active alcohol of formula $C_9H_{12}O_2$ produced the following compound when refluxed with $KMnO_4$. What is the structure of $(A)$? The original compound showed these properties also:
$\mathop {C_9H_{12}O_2}\limits_{(A)} \xrightarrow{Na} H_2 \text{ liberated}$
$\mathop {C_9H_{12}O_2}\limits_{(A)} \xrightarrow{Br_2} \text{ no rapid reaction}$
$\mathop {C_9H_{12}O_2}\limits_{(A)} \xrightarrow[{cool}]{CrO_3 / H^{+}} C_9H_8O_3$

In the reaction sequence:
$\text{Ethanol}$ $\xrightarrow{PCl_5} X$ $\xrightarrow{\text{alc. } KOH} Y$ $\xrightarrow[H_2O, \Delta]{H_2SO_4, \text{room temp.}} Z$
The product $Z$ is:

$ROH + HX \to RX + H_2O$
In the above reaction,the reactivity order of hydrogen halides is