Question

HELP ASAP PLEASAE!!!

The structural formula for butane is: CH3-CH2-CH2-CH3 Which of these structures represents a correct isomer of butane?
A. CH3-CH2- CH3 CH3

B. CH3-CH- CH3 CH3

C. CH3-CH2- CH3 CH2

D. CH2-CH2- CH3 CH3

Answer 1

I believe the answer is A. However, I would double check the formula.