
Answer
1. Chlorobutane (n-butyl chloride)
Structure: CH₃–CH₂–CH₂–CH₂Cl
Unique Carbon Environments: 1
2. 2-Chlorobutane (sec-butyl chloride)
Structure: CH₃–CH(Cl)–CH₂–CH₃
Unique Carbon Environments: 2
3. 1-Chloro-2-methylpropane (isobutyl chloride)
Structure: (CH₃)₂CH–CH₂Cl
Unique Carbon Environments: 2
4. 2-Chloro-2-methylpropane (tert-butyl chloride)
Structure: (CH₃)₃C–Cl
Unique Carbon Environments: 1
Total Unique Carbon Environments: 1 + 2 + 2 + 1 = 6
