Question

In which region of the infrared spectrum would you expect to find a peak characteristic of a triple bond stretch?

1) 4000 - 3000cm-1
2) 2500 - 2000cm-1
3) 2000 - 1500cm-1
4) 1500 - 750cm-1

Answer 1

Triple bond stretches are typically observed in the infrared spectrum in the region of 2) 2500 - 2000 cm-1, specifically within 2100-2250 cm-1 for alkynes.

Step-by-step explanation:

The peak characteristic of a triple bond stretch in an infrared spectrum would be found in the region of 2500 - 2000 cm-1.

This is because alkynes, which contain a carbon-carbon triple bond, have characteristic IR absorbance peaks in the range of 2100-2250 cm-1 due to the stretching of the triple bond. Therefore, the correct region for the characteristic peak of a triple bond stretch would be option 2) 2500 - 2000 cm-1.