Provide the formula,structure,$IUPAC$ names,and common names of alkenes having carbon atoms $n = 1, 2, 3, 4$.

(N/A) The general formula for alkenes is $C_nH_{2n}$. Note that $n=1$ (methene) is a highly reactive intermediate (carbene) and not a stable alkene. The table below summarizes the requested information:

No. of Carbon	Formula	Structure	$IUPAC$ (Common Name)
$C_1$	$CH_2$	$:CH_2$	Methene (Methylene)
$C_2$	$C_2H_4$	$CH_2=CH_2$	Ethene (Ethylene)
$C_3$	$C_3H_6$	$CH_3-CH=CH_2$	Propene (Propylene)
$C_4$	$C_4H_8$	$(i)$ $CH_3CH_2CH=CH_2$ (ii) $CH_3CH=CHCH_3$ (iii) $CH_3-C(CH_3)=CH_2$	$(i)$ But$-1-$ene ($\alpha$-butylene) (ii) But$-2-$ene ($\beta$-butylene) (iii) $2-$methylprop$-1-$ene (Isobutylene)