IR Destroyer

[Happyfaace]

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So I was answering Q 101 DAT DESTROYER. The answer makes sense. However, if IR radiation is absorbed when the molecule has a dipole, why then alkyne has 2 peaks( 2200 and 3300)? Does alkyne have dipole? I thought it is symmetrical.

 

[OUDent88]

So I was answering Q 101 DAT DESTROYER. The answer makes sense. However, if IR radiation is absorbed when the molecule has a dipole, why then alkyne has 2 peaks( 2200 and 3300)? Does alkyne have dipole? I thought it is symmetrical.

Only terminal alkynes will show the 2 peaks around 2200 and 3300. Internal alkynes are symmetrical and therefore will not show any peaks.

 

[Happyfaace]

That makes sense! Thanks a lot.