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(a) Unbranched chain of seven carbon atoms, one carbon-carbon double bond (b) Unbranched chain of seven carbon atoms, two carbon-carbon double bonds (c) Seven carbon atoms, one methyl group, one carbon-carbon double bond (d) Seven carbon atoms, two methyl groups, one carbon-carbon double bond How many constitutional isomers exist that fit each of the following specifications? (a) Unbranched chain of seven carbon atoms, one carbon-carbon double bond (b) Unbranched chain of seven carbon atoms, two carbon-carbon double bonds (C) Seven carbon atoms, one methyl group, one carbon-carbon double bond (d) Seven carbon atoms, two methyl groups, one carbon-carbon double bond