Match the list-I with list-II

List-I	List-II
(A) cis-2-butene Trans-2-butene	(i) Functional isomers
(B) Diethyl ether, Butanol	(ii) Stereoisomers
(C) 1-Butene, 2-butene	(iii) Positional isomers
	(iv) Chain isomers

The correct matching option is A-ii, B-i, C-iii.

Let us analyze each pair given in List-I and match them with their correct classification in List-II step-by-step:

(A) cis-2-butene and trans-2-butene:
Both cis-2-butene and trans-2-butene have the same molecular formula (${\mathrm{C}}_4{\mathrm{H}}_8$) and the same connectivity of atoms, but they differ in the spatial arrangement of the methyl groups relative to the double bond. Molecules that have the same connectivity but differ in three-dimensional spatial orientation are called stereoisomers (specifically, geometrical isomers or cis-trans isomers).
Therefore, (A) matches with (ii) Stereoisomers.

(B) Diethyl ether and Butanol:
Diethyl ether (${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{O}{\mathrm{CH}}_2{\mathrm{CH}}_3$) and Butanol (${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH}$) both have the molecular formula (${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$). However, they contain different functional groups (ether vs. alcohol). Compounds with the same molecular formula but different functional groups are known as functional isomers.
Therefore, (B) matches with (i) Functional isomers.

(C) 1-Butene and 2-butene:
1-Butene (${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$) and 2-butene (${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$) both have the carbon skeleton of butane and the molecular formula (${\mathrm{C}}_4{\mathrm{H}}_8$). They differ only in the position of the double bond (at carbon-1 vs. carbon-2). Compounds with the same carbon skeleton but different positions of functional groups or double/triple bonds are called positional isomers.
Therefore, (C) matches with (iii) Positional isomers.

Combining all the correct matches:
A - ii
B - i
C - iii

Thus, the correct option is A-ii, B-i, C-iii.