7. Look at the mass spectrum of 2-methylhexane. What is the m/z value of the M+ peak and of the base peak? Give possible structures of the fragments giving rise to the large peaks at m/2 = 85, 57, and 43. (4pt) 100 - 43 80 60 Relative Intensity 85 57 20 100 0 10 20 30 40 50 60 70 80 90 100 m/z