Name the following compound:

${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_3$

Name the following compound:

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

From the given compounds which of the compounds are alcohols and which are carbonyl compounds?

 From the given compounds which of the carbonyl compounds are aldehydes and which are ketones?

Draw the skeletal formulae of :

pentan-$2$-one

Draw the skeletal formulae of :

pentan-$3$-one