damiilare3873 damiilare3873 Today at 12:34 AM Chemistry Answered Dimethylbutane gives a significant fragment peak at m/z = 57. Which of the following is the most probable structure of the fragment ion?a) CH₃CH₂CH₂CH₂⁺b) CH₃CH₂CH₂⁺c) CH₃CH₂CH₂CH₂CH₃⁺d) CH₃CH₂CH₂CH₃⁺