The correct $IUPAC$ name of $H_3C - C(CH_3)_2 - O - C_2H_5$ is

Which of the following represents the correct $IUPAC$ name for the compounds concerned?
$(a)$ $2,2-$ Dimethylpentane or $2-$ Dimethylpentane
$(b)$ $2,4,7-$ Trimethyloctane or $2,5,7-$ Trimethyloctane
$(c)$ $2-$ Chloro$-4-$methylpentane or $4-$ Chloro$-2-$methylpentane
$(d)$ But$-3-$yn$-1-$ol or But$-4-$ol$-1-$yne

What is the correct $IUPAC$ name of the given compound?

Give the structural formula for the following compounds:
$(i)$ Butanone
$(ii)$ Ethanamide

Select the structure with the correct numbering for the $IUPAC$ name of the compound.

Identify the compound that does not correctly match with its common name.

$A$. $HCHO$	Formaldehyde
$B$. $C_6H_5NH_2$	Aniline
$C$. $CH_3CH(CH_3)CH_3$	$n-$Butane
$D$. $CH_3CH(OH)COOH$	Lactic acid