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# Isomers which can not be interconverted through rotation around a single bond are : (i) Conformers ; (ii) diastereomers ; (iii) Enantiomers ; (iv) Positional isomers;

$(a)\;(i),(ii)\; and\;(iii) \\ (b) \; (ii),(iii)\;and \;(iv) \\ (c) \;(i),(ii)\;and \;(iv) \\ (d)\;(ii)\;and (iv)$

Conformers can be interconverted through rotation about a single bond.
So, $(ii),(iii)\;and \;(iv)$
Hence b is the correct answer.