Discussion
Eclipsed and staggered forms of n-butane are
Answer: C
The eclipsed and staggered forms of n-butane are rotamers (conformers).
They differ only by rotation about the central C-C single bond. Since that rotation is easy at room temperature, the forms interconvert rapidly and are different conformations of the same molecule, not separable isomers.
Chain, position and metamers are structural isomers, which differ in how atoms are bonded. Geometrical isomers differ in the arrangement round a double bond or ring, where rotation is restricted.
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