Which of the following statements is (are) true about a compound that has a mole
ID: 985856 • Letter: W
Question
Which of the following statements is (are) true about a compound that has a molecular ion in its mass spectrum at mass 69, and shows prominent peaks in its IR spectrum at 2250 cm-1?
options:
The compound has a molecular weight of 70.
The compound contains a cyano or alkyne group.
Both (The compound has a molecular weight of 70) and (The compound contains a cyano or alkyne group) are true statements.
The compound has a molecular weight of 70.
The compound contains a CO group.
The compound contains a cyano or alkyne group.
Both (The compound has a molecular weight of 70) and (The compound contains a CO group) are true statements.
Both (The compound has a molecular weight of 70) and (The compound contains a cyano or alkyne group) are true statements.
Explanation / Answer
Mass spectra contains various peaks like Molecular ion peak, base peak etc. The molecular ion peak is the peak generated by the formation of radicai-cation species from molecule by loss of an electron and electrons do not count for molecular mass hence molecular ion peak position on molecular mass axis in mass spectra gives the molecular weight of the compound.
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