How would the following pair of compounds differ in their IR spectra? HC CCH_2N(

Question

How would the following pair of compounds differ in their IR spectra? HC CCH_2N(CH_2CH_3)_2 and CH_3(CH_2)_5C N Compound on the left would have the following distinguishing absorptions: strong, broad peak at 3600-3200 cm^-1 medium peak at 3500-3200 cm^-1 medium peak at 3300 cm^-1 medium peak at 3150-3000 cm^-1 strong peak at 3000-2850 cm^-1 medium peak at 2250 cm^-1 strong peak at ~1700 cm^-1 medium peak at 1650 cm^-1 medium peak at 1600, 1500 cm^-1 no distinguishing peaks Compound on the right would have the following distinguishing absorptions: strong, broad peak at 3600-3200 cm^-1 medium peak at 3500-3200 cm^-1 medium peak at 3300 cm^-1 medium peak at 3150-3000 cm^-1 strong peak at 3000-2850 cm^-1 medium peak at 2250 cm^-1 strong peak at -1700 cm^-1 medium peak at 1650 cm medium peak at 1600, 1500 cm^-1 no distinguishing peaks

Explanation / Answer

IR analysis of organic compounds

The given pair,

Compound on the left (alkyne) would have the following distinguishing peak

- medium peak at 3300 cm-1

for the C-H bond of alkyne

Compound on the left (nitrile) would have the following distinguishing peak

- medium peak at 2250 cm-1

for the CN bond of nitrile

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