A part of a homologous series is shown below.
${\mathrm{C}}_3{\mathrm{H}}_4, {\mathrm{C}}_4{\mathrm{H}}_6, {\mathrm{C}}_5{\mathrm{H}}_8$

Which of these compounds is a part of the series shown above?

The picture shows the bonds between atoms in two allotropes of carbon.

Which allotrope is harder? Explain your answer.

On undergoing complete combustion in an adequate supply of oxygen, an organic compound produces only carbon dioxide and water vapour as the products. 

Based on this information, Which of the following homologous series could the compound belong to?

$\left(\mathrm{P}\right)$ alkanes
$\left(\mathrm{Q}\right)$ alcohols
$\left(\mathrm{R}\right)$ aldehydes

A compound with which of the following functional groups is most likely to cause the decomposition of baking soda to produce carbon dioxide?

Heating an alcohol with concentrated sulphuric acid results in the dehydration of the alcohol to give the alkene as shown by the reaction of ethanol to give ethene.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\stackrel{\mathrm{Hot} \mathrm{conc}.\mathrm{sulphuric} \mathrm{acid}}{\to }{\mathrm{CH}}_2={\mathrm{CH}}_2$

Pramila heated $2$-butanol (shown below) with concentrated sulphuric acid.

Write the structural formulae of all the possible products of the reaction.

An alkane has $11$ carbon atoms arranged within ring structures as shown below:

What is the molecular formula of alkane?