Identify the product formed when vapours of $2-$methylpropan$-2-$ol are passed over hot copper.

Arrange the following compounds in increasing order of their boiling points:
$CH_3CHO, CH_3CH_2OH, CH_3OCH_3, CH_3CH_2CH_3$

What is the major product of the following reaction?
$HO-CH_2-CH_2-CH_2-CH_2-Cl \xrightarrow{Alc. KOH} ?$

Which of the following compounds can be used as antifreeze in automobile radiators?

Arrange the following alcohols in increasing order of reactivity towards elimination reaction:
$(I)$ $NO_2-CH_2-CH_2-CH_2-CH_2OH$
$(II)$ $CH_3-CH_2-CH(NO_2)-CH_2OH$
$(III)$ $CH_3-CH(NO_2)-CH_2-CH_2OH$
$(IV)$ $CH_3-CH_2-CH_2-CH_2OH$
Select the answer from the codes given below:

Reactivity of given alcohols for acidic dehydration can be explained by $Ph-CH_2-CH(OH)-CH_3 > CH_3-CH_2-CH(OH)-CH_3$: