Using ^12C, ^1H, ^14N, ^16O, which compounds show a molecular ion at an odd m/z value?

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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si091

Using $X_{12} X_{2}^{212} C$ , $X_{1} X_{2}^{21} H$ , $X_{14} X_{2}^{214} N$ , $X_{16} X_{2}^{216} O$ , which compounds show a molecular ion at an odd m/z value?

Aethanamide, $CH X_{3} CONH X_{2}$
Burea, $NH X_{2} CONH X_{2}$
Caniline, $C X_{6} H X_{5} NH X_{2}$
Dnitrobenzene, $C X_{6} H X_{5} NO X_{2}$

Answer: A, C, D

Molecular masses: ethanamide 59, urea 60, aniline 93, nitrobenzene 123. Compounds with one nitrogen (odd number) have odd mass, whereas urea with two nitrogens has an even mass.

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Using X12​X2212​C, X1​X221​H, X14​X2214​N, X16​X2216​O, which compounds show a molecular ion at an odd m/z value?

Answer: A, C, D

More questions on Degree of unsaturation and spectroscopic clues

Using $X_{12} X_{2}^{212} C$ , $X_{1} X_{2}^{21} H$ , $X_{14} X_{2}^{214} N$ , $X_{16} X_{2}^{216} O$ , which compounds show a molecular ion at an odd m/z value?