Which of the following structures have the correct common name?
A)I and II
B)II and IV
C)II and III
D)III and IV

Question

Which of the following structures have the correct common name? 
A)I and II 
B)II and IV 
C)II and III 
D)III and IV

Quizplus · Accepted Answer

I is a cyclohexane with one chlorine attached. The correct common name for I is chlorocyclohexane. 
II is a cyclohexane with one methyl and one ethyl attached. The correct common name for II is 1-methyl-2-ethylcyclohexane. 
III is an ethylcyclohexane with one methyl attached. The correct common name for III is 1-ethyl-3-methylcyclohexane. 
IV is an ethylcyclohexane with one ethyl attached. The correct common name for IV is 1,3-diethylcyclohexane. 
Therefore, only II and III have the correct common names.

Which of the Following Structures Have the Correct Common Name