What type of signal(s) would you observe in the mass and (or) infrared spectrum of 2-chloro-2-methylpropane?

mass spectrum of tertiary butyl chloride having overall mass as 92 m /Z for Cl35 and 94 m /Z for Cl37. The major peak at 57 m /Z for the removal of chlorine - 37 radical whereas other peak appear at 77 m /Z after removal of a methyl radical.

Ir of tertiary butyl chloride appear majorly at 3000 Cm^-1 whereas other small peaks appear between 1400- 1550 Cm-1

the first point, i am pretty sure.

neutrons are in the middle of the atom and the electrons, which are much smaller.