Question

the molecules below are constitutional isomers. true false question 6 (10 points) what is the structure of 1 - ethyl - 2 - methylcyclohexane? none of the choices are correct. question 7 (10 points)

Explanation:

Step1: Recall constitutional isomer definition

Constitutional isomers have same molecular formula but different connectivity. The first - given molecule has 7 carbon atoms and the second one also has 7 carbon atoms but different connectivity. So the answer to the first question is True.

Step2: Analyze 1 - ethyl - 2 - methylcyclohexane structure

1 - ethyl - 2 - methylcyclohexane has a cyclohexane ring with an ethyl group ($-CH_2CH_3$) at the 1 - position and a methyl group ($-CH_3$) at the 2 - position. The correct structure is the one where there is a six - membered ring with an ethyl side - chain on one carbon and a methyl side - chain on the adjacent carbon.

Answer:

Question 5: True
Question 6: The structure with a cyclohexane ring having an ethyl group at the 1 - position and a methyl group at the 2 - position (the second structure among the options for Question 6).