Consider the sets I, II and III. Identify the set(s) which is (are) correctly matched.

I. Staggered ethane > eclipsed ethane ..........torsional strain.

II. 2, 2-dimethylbutane > 2-methylpentane ......... boiling point

III. cis-but-2-ene > trans-but-2-ene ......... dipole moment

The empirical formula weight of ' $Z$ ' in the given reaction sequence is

$$ n \text {-propyl bromide } \xrightarrow[\text { Dry ether }]{\mathrm{Na}} X \xrightarrow[\substack{773 \mathrm{~K} \\ 20 \mathrm{~atm}}]{\mathrm{v}_2 \mathrm{O}_5} Y \xrightarrow[\text { UV } 500 \mathrm{~K}]{\mathrm{Cl}_2} Z $$

Which one of the following compounds does not give benzoic acid when treated with alkaline $\mathrm{KMnO}_4$ ?

Consider the following

Statement I Kolbe's electrolysis of sodium propionate gives $n$-hexane as product.

Statement II In Kolbe's process $\mathrm{CO}_2$ is liberated at anode and $\mathrm{H}_2$ is liberated at cathode.

Correct answer is