Discussion
The correct statement for the following structures is that they are :
Answer: D
The two structures are structural isomers.
Read each Newman projection carbon by carbon. In the left one, the front carbon carries two CH3 groups and one H, and the rear carbon carries three H atoms. That is (CH3)2CH-CH3, 2-methylpropane (isobutane). In the right one, each carbon carries two H atoms and one CH3 group, which is CH3CH2-CH2CH3, butane.
Both are C4H10, but their atoms are connected differently, which is what makes them structural (chain) isomers.
Conformational isomers would be the same molecule turned about a single bond, and enantiomers must be chiral mirror images; neither butane nor isobutane is chiral. 'Not isomers' is wrong because the molecular formula is the same.
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