Write $IUPAC$ names of the products obtained by the ozonolysis of the following compounds:
$(i)$ $Pent-2-ene$
$(ii)$ $3,4-Dimethylhept-3-ene$
$(iii)$ $2-Ethylbut-1-ene$
$(iv)$ $1-Phenylbut-1-ene$

(N/A) Ozonolysis of alkenes involves the cleavage of the $C=C$ double bond to form carbonyl compounds (aldehydes or ketones).
$(i)$ $Pent-2-ene$ $(CH_3-CH=CH-CH_2-CH_3)$: Cleavage yields $Ethanal$ $(CH_3CHO)$ and $Propanal$ $(CH_3CH_2CHO)$.
$(ii)$ $3,4-Dimethylhept-3-ene$ $(CH_3-CH_2-C(CH_3)=C(CH_3)-CH_2-CH_2-CH_3)$: Cleavage yields $Butan-2-one$ $(CH_3-CO-CH_2-CH_3)$ and $Pentan-2-one$ $(CH_3-CO-CH_2-CH_2-CH_3)$.
$(iii)$ $2-Ethylbut-1-ene$ $(CH_3-CH_2-C(=CH_2)-CH_2-CH_3)$: Cleavage yields $Methanal$ $(HCHO)$ and $Pentan-3-one$ $(CH_3-CH_2-CO-CH_2-CH_3)$.
$(iv)$ $1-Phenylbut-1-ene$ $(C_6H_5-CH=CH-CH_2-CH_3)$: Cleavage yields $Benzaldehyde$ $(C_6H_5CHO)$ and $Propanal$ $(CH_3CH_2CHO)$.