Mass spectra and infrared spectroscopy Quiz
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5 questions, one answer each
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1. A compound has M⁺ at m/z 74. What is its relative molecular mass?
- A. 37
- B. 74
- C. 148
- D. 29
2. Which bond absorbs at 1715 cm⁻¹?
- A. O–H in an alcohol
- B. C=O
- C. C–H in an alkane
- D. N–H
3. A spectrum shows a very broad absorption at 2500–3300 cm⁻¹ and a peak at 1710 cm⁻¹. What is the functional group?
- A. Alcohol
- B. Ketone
- C. Carboxylic acid
- D. Alkene
4. Which ion gives the peak at m/z 31 in the mass spectrum of ethanol (M⁺ = 46)?
- A. CH₃⁺
- B. C₂H₅⁺
- C. OH⁺
- D. CH₂OH⁺
5. Which pair of ions would be formed by propanone and give peaks at m/z 43 and 15?
- A. CH₃CO⁺ and CH₃⁺
- B. C₃H₇⁺ and CH₃⁺
- C. COOH⁺ and CH₃⁺
- D. CH₃CO⁺ and C₂H₅⁺