The band intensity is in a medium to weak level. The stretching vibration of triple bonds C≡C and C≡N have absorption bands of about 2100–2200 cm -1. It is therefore relatively easy to identify the aldehyde group (together with the C=O stretching at about 1700 cm -1 ) since essentially no other absorptions occur at these wavenumbers (see the example of the IR spectrum of butanal in Figure 6.4d ).
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