List-I Alkene		List-II Ozonoloysis products
(a)	Propene	(i)	Ethanal Only
(b)	Butene-1	(ii)	Ethanal +Methanal
(c)	Butene-2	(iii)	Butanal+Methanal
(d)	Pentene-1	(iv)	Propanal +Methanal
		v)	Propanal only

	(a)	(b)	(c)	(d)
(1)	ii	iv	i	iii
(2)	ii	i	v	iv
(3)	v	ii	i	iii
(4)	iii	i	ii	v

$$\begin{gathered} {\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_2\stackrel{{\mathrm{O}}_3/\mathrm{Zn}}{\to }{\mathrm{CH}}_3\mathrm{CH}=\mathrm{O} +\mathrm{O}={\mathrm{CH}}_2 \\ \mathrm{Ethanal} +\mathrm{Methanal} \end{gathered}$$

$$\begin{gathered} {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2\stackrel{{\mathrm{O}}_3/\mathrm{Zn}}{\to }{\mathrm{CH}}_3 {\mathrm{CH}}_2\mathrm{CH}=\mathrm{O} +\mathrm{O}={\mathrm{CH}}_2 \\ \mathrm{Propanal} +\mathrm{Methanal} \end{gathered}$$

$$\begin{gathered} {\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3\stackrel{{\mathrm{O}}_3/\mathrm{Zn}}{ \to }{\mathrm{CH}}_3\mathrm{CH}=\mathrm{O} \\ \mathrm{Ethanal} \end{gathered}$$

$$\begin{gathered} {\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}={\mathrm{CH}}_2\stackrel{{\mathrm{O}}_3/\mathrm{Zn}}{\to }{\mathrm{CH}}_3 {\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CH}=\mathrm{O} +\mathrm{O}={\mathrm{CH}}_2 \\ \mathrm{Butanal} +\mathrm{Methanal} \end{gathered}$$