$C_6H_6$ $\xrightarrow[(ii)\,\,Zn-Hg/HCl]{(i)\,\,CH_3COCl/AlCl_3}$ $(P)$ $\xrightarrow[(ii)\,\,H_2O/K_2CO_3]{(i)\,\,NBS}$ $(Q)$
Major product $(Q)$ of the following sequence is:

With which of the following reactants does the treatment of primary alcohol yield aldehydes?

Ethanol is converted into ethoxyethane by:

An alcohol $X$ $(C_5H_{12}O)$ on dehydration gives $Y$ (major product). Reaction of $Y$ with $HBr$ gave $Z$ ($C_5H_{11}Br$,major product). $Z$ undergoes nucleophilic substitution in two steps. What are $X$ and $Y$?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Butan$-1-$ol has higher boiling point than ethoxyethane.
Reason $R:$ Extensive hydrogen bonding leads to stronger association of molecules.
In the light of the above statements,choose the correct answer from the options given below:

Arrange the following in order of their reactivity when reacting with $HCl/ZnCl_2$ (Lucas reagent):
$I. CH_3-C(CH_3)_2-OH$
$II. CH_3-CH(CH_3)-OH$
$III. CH_3-CH_2-OH$
$IV. Ph-C(CH_3)_2-OH$