Q8 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Mass Spec · Marks: 2 · Difficulty: Medium
The mass of metastable ion produced due to decomposition of $\mathrm{F_1^+}$ in the following mass fragmentation sequence is
Diethyl-phthalate (M + 222) $\rightarrow$ $\mathrm{F_1^+} \rightarrow \mathrm{F_2^+} + \mathrm{CO}$
(177)(a)141.2
(b)125.4
(c)45.0
(d)210.2
Answer
Answer (as printed): B
Explanation
Mass of metastable ion is given by: [M22/M1] (122´122)/177 = 125.4
Explanation as extracted from the printed page; notation may be imperfect.
Study loop for Organic Spectroscopy