Discussion
How does a triple bond's stretching frequency compare with a double bond's?
Answer: A
A triple bond is stiffer, so its force constant is larger and the band appears near 2200 against a double bond's 1650. The reduced mass is unchanged between them, since the same atoms are involved, which isolates the force constant as the cause. Bond order rising from one to two to three walks the band up the spectrum in steps, and that progression is one of the most useful regularities the technique offers. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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