Which of the following statement(s)is (are)true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1? A)The compound has a molecular mass of 70. B)The compound contains a C=O group. C)The compound contains a cyano or alkyne group. D)Both (The compound has a molecular mass of 70)and (The compound contains a C=O group)are true statements. E)Both (The compound has a molecular mass of 70)and (The compound contains a cyano or alkyne group)are true statements.

Question

Quizplus · Accepted Answer

EThe molecular ion peak at mass 69 indicates the molecular mass of the compound is 69, not 70, making statement A incorrect and thus D and E need to be evaluated on the second part of their statements. The IR spectrum peak at 2250 cm^-1 is characteristic of cyano (C≡N) groups or alkynes (C≡C), not C=O groups, which typically absorb around 1700 cm^-1. Therefore, statement C is correct, and since A is incorrect, E is the correct combination statement, indicating the compound has a molecular mass of 69 and contains a cyano or alkyne group.

Which of the Following Statement(s)is (Are)true About a Compound That