1. Using the rule of 13, what is a possible formula for M=104 (100%) on a mass spectrum?

A) C₈H₈

B) C₇H₂₀

C) all of the above are possible

2. Using the rule of 13, what is a possible formula for M=150 (100%) on a mass spectrum?

A) C₉H₁₀O₂

B) C₉H₁₄N₂

C) all of the above are possible

3. Mass spec: M = 161 (100%), 163 (33%). Which of the following is a possible molecular formula?

A) C₉H₁₈Cl

B) C₈H₁₆NCl

C) all of the above are possible

4. Mass spec: M = 152 (100%), 154 (66%), 156 (11%). Which of the following is a possible molecular formula?

A) C₆H₁₀Cl₂

B) C₅H₈NCl₂

C) all of the above are possible