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Direction (Q. Nos. 19-20) Consider the following four compounds (I) `CH_(3) - CH_(2) - CH_(2) - CH_(2) - overset(O)overset(||)(C) - H` (II) `CH_(3) - CH_(2) - CH_(2) - overset(O)overset(||)(C) - CH_(3)` (III) `CH_(3) - CH_(2) - underset(O)underset(||)(C) - CH_(2) - CH_(3)` (IV) `CH_(3) - underset(CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C) - H` Which of the following pairs are not functional group isomers ?A. II and IIIB. II and IVC. I and IVD. I and II

Answer» Correct Answer - A::C
Two or more compounds having the same molecular formula but different functional groups are called functional isomers.
I. Aldehyde II. Ketone
III. Ketone IV. Aldehyde
Here, II and III, I and IV are not functional group isomers. Thus, options (a) and (c) are correct


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