Question

Do the condensed formulas in each pair represent the same compound or constitutional isomers? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\) and CCCCCC (each is \(\mathrm{C}_{6} \mathrm{H}_{14}\) ) (b) CC(C)CC(C)C and CCC(C)C(C)C (each is \(\mathrm{C}_{7} \mathrm{H}_{16}\) )

Short answer

Pair A: 1. CH3CH2CH2CH2CH2CH3 2. CCCCCC (C6H14) Pair B: 1. CC(C)CC(C)C 2. CCC(C)C(C)C (C7H16) Answer: Pair A represents the same compound, and Pair B represents constitutional isomers.

Step-by-step solution

The first condensed formula (\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\)) represents a straight-chain hydrocarbon with six carbon atoms. #Step 2: Analyze the second condensed formula#

The second formula given in SMILES notation (CCCCCC) also represents a straight-chain hydrocarbon with six carbon atoms. #Step 3: Compare the two formulas#

Since both formulas represent straight-chain hydrocarbons with six carbon atoms, they represent the same compound. #Pair B# (b) Given two condensed formulas: 1. CC(C)CC(C)C 2. CCC(C)C(C)C (each is \(\mathrm{C}_{7} \mathrm{H}_{16}\)) #Step 1: Analyze the first condensed formula#

The first condensed formula given in SMILES notation (CC(C)CC(C)C) represents a branched hydrocarbon with seven carbon atoms. #Step 2: Analyze the second condensed formula#

The second formula given in SMILES notation (CCC(C)C(C)C) also represents a branched hydrocarbon with seven carbon atoms. #Step 3: Compare the two formulas#

Since both formulas represent branched hydrocarbons with seven carbon atoms, but the arrangement of the carbon atoms is different in both structures, they represent constitutional isomers. In conclusion, Pair A represents the same compound, and Pair B represents constitutional isomers.