题目内容

Among -OCH3, -CCH3, and -NCH3, -NCH3 displays the largest proton chemical shift in NMR spectrum.

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In the mass spectrum of bromoethane, two ion peaks of equal intensity are observed, the most likely ones are ( ).

A. m/z 19 and 25
B. m/z 95 and 93
C. m/z 29 and 95
D. m/z 93 and 15

If a strong peak of m/z = 31 appears in the mass spectrum of a compound, the compound cannot be an amine.

It is known that the infrared spectrum of a certain compound has main absorption at 1450 cm-1, 3000～2800 cm-1, 1380 cm-1, 725 cm-1, etc., then the compound may be （）

A. alkynes
B. aromatics
C. alkanes
D. alkenes

The stretching vibration of water molecules will not produce infrared absorption peaks.