Which of the molecules gives rise to a molecular ion with an odd value of m/e?

Name: Which of the molecules gives rise to a molecular ion with an odd value of m/e?
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Question

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The only molecule that has an odd value for m/e is molecule B, which has a molecular ion with an m/e value of 143. This is because the chlorine atom in the molecule has an odd number of neutrons, which affects the mass of the molecule and leads to an odd m/e value. The other molecules all have even m/e values.

Which of the Molecules Gives Rise to a Molecular Ion