Q21 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Mass Spec · Marks: 2 · Difficulty: Medium
The compound that shows peaks in the EI mass spectrum at $m/z$ 121, 105, 77, 44 is
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Benzamide: M⁺ 121, loss of NH₂ gives PhCO⁺ 105, loss of CO gives C₆H₅⁺ 77, and H₂NCO⁺ appears at m/z 44 (b).
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