1. Why is the tetrabutylammonium cation relatively soluble in solvents of low polarity?
2. A list of atomic masses of the elements says that the mass of Br is 80 amu. In the mass spectrum of bromobenzene, no significant signal is seen at m/z 157. Two signals of nearly equal abundance are found at m/z 156 and m/z 158. Explain why this is so and show formulas of the two ions as 156 and 158.