Question

In the mass spectrum of 1,3-
dichloroeth-ane, approximate ratio
of peaks at m/z values 98, 100, 102
will be
A 3:1:1
B 9:6:1
C 1:1:2​

Answer 1

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Answer 2

The correct option is C.

• Cl in 1,2-dichloroethane can exist as Cl-35 and Cl-37 isotopes.
• If the two Cl atoms exist as Cl-35 isotope then the m/z will be 98. It has one possibility so, the intensity is 1.
• If the two Cl atoms exist as Cl-possibility the m/z will be 102. It has one possibilities so, the intensity is 1.
• If the one Cl atoms exist as a Cl-35 Isotope and another one as Cl-37 then the m/the z will be 102. It has two possibilities so, intensity is 2.
• Thus intensity ratio will be 1:1:2.
• So, the approximate ratio of the peaks is 1:1:2.