Indicate whether each pair of structures represents the same compound, structural isomers (also called constitutional isomers), or different compounds. Compound 1 has the condensed formula C H 3 C H (C H 3) C H 2 C H 3. Compound 2 has the condesned formula C H 3 C H 2 C H (C H 3) C H 3. A Compound 3 has the condensed formula C H 3 C H 2 C H (C H 3) C H 2 C H 3. Compound 4 has the condensed formula C H 3 C H (C H 3) C H (C H 3) C H 3. B The structures in pair A are the same compound. structural isomers. different compounds. The structures in pair B are different compounds. structural isomers. the same compound.