Identify the hetero atoms present in the compound given below:
 $\mathrm{CH}3-\mathrm{CH}2-\mathrm{O}-\mathrm{CH}2-{\mathrm{CH}}_2\mathrm{Cl}$

Identify and name the following compound.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$.

Identify and name of the following compound:

Write the name of the following compound:

What is a homologous series? Explain with an example. 

Write the name of the following compound:

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$

Write the name of the following compound:

${\mathrm{CH}}_3-\mathrm{Cl}$

Observe the correlation in the first pair and complete the second pair.

${\mathrm{CH}}_3\mathrm{OH}$ : Methanol. : :${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$ : _____.