The alcohol which reacts most easily with conc. $HCl$ is

Which of the following is the structure of an alcohol with molecular formula $C_5H_{12}O$?

$A$ compound $X$ with the molecular formula $C_3H_8O$ yields a compound with the formula $C_3H_6O$ upon oxidation. To which of the following classes of compounds could $X$ belong?

Which is the best method to prepare cyclohexene from cyclohexanol?

The effective factor in the preparation of alkene from alcohol using $Al_2O_3$ is ................ .

Match the reagents in Column-$I$ with the major products obtained from the reaction of $Butan-1-ol$ in Column-$II$.

Column-$I$ (Reagents)	Column-$II$ (Products)
$A$. $HCl + ZnCl_2$	$i$. $CH_3CH=CHCH_3$
$B$. $HBr$	$ii$. $CH_3CH_2CH_2CH_2Cl$
$C$. $SOCl_2$	$iii$. $CH_3CH_2CH_2CH_2Br$
$D$. $H_2SO_4, \Delta$	$iv$. $CH_3CH_2CH_2CH_2Cl$