Discussion
A carbon-carbon triple bond stretch appears near
Answer: A
Correct answer: 2200 reciprocal centimetres
The stretching frequency rises with bond strength and falls with reduced mass, so a triple bond absorbs well above a double bond. A carbon-carbon triple bond appears near 2200 and a nitrile near 2250; a carbon-carbon double bond near 1650. The band is often weak, since a symmetrically substituted alkyne has little dipole change, and in a perfectly symmetrical one it vanishes altogether.
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