The mass of metastable ion produced due to decomposition of F1+ in the following mass fragmentation sequence is arrayl Diethyl-phthalate F1+ F2+ + CO \\ \; (M+ = 222) (177) array

ABC26OR0128 · Organic Spectroscopy

Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Mass Spec · Exam: CSIR-NET DEC 2014 · Marks: 2 · Difficulty: Medium

The mass of metastable ion produced due to decomposition of $\mathrm{F_1^{+}}$ in the following mass fragmentation sequence is

\[ \begin{array}{l} \text{Diethyl-phthalate} \rightarrow \mathrm{F_1^{+}} \rightarrow \mathrm{F_2^{+}} + \mathrm{CO} \\ \qquad\; (\mathrm{M^{+}} = 222) \qquad\qquad (177) \end{array} \]

(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 $m^{*} = \dfrac{M_2^{2}}{M_1}$ $m^{*} = \dfrac{(122)(122)}{177} = 125.4$

Open in whiteboard · Browse this chapter in the app