Question

Identify the aldehyde/ketone, whose spectrum is shown here:

101 100 95- 90- 85- 80 74 62cm-1, 95 271 4.24cm-1, 93.64%T 984:34cm-1, 93.45%T 1 1 17.16cm-1892.559m-1, 91.30 ㎝-1, 91.81%) 2964.30에-1, 85.17%T 1454.1 9cmt1, 85.43%T 2014.66m-1, 80.92%T 1 378.21cm-1. 81.45%T e 75 70 65- 60- 55- 51 1 724.74cm-1, 52.23%T 54000 3500 300 2500 2000 1500 1000 450 cm-1

These are the options given as to what it could be:

p-Anisaldehyde, Benzaldehyde, Butanal, 2-Butenal, 2-Chlorobenzaldehyde, Cinnamaldehyde, Citral, Citronellal, 2-Ethylbutanal, Furfural, Heptanal, Hexanal, 2-Hydroxybenzaldehyde (salicylaldehyde), Methylbutanal, 3-Methylbutanal, 5-Methylfurfural, Phenylacetaldehyde, 2-Tolualdehyde, p- Tolualdehyde

Answer 1

First of IR won't tell exact structure and gives idea of functional groups only.

Then it is an aliphatic aldehyde since it peaks at 2964 for CH stretch and 2714 and 2914 for aldehyde CH stretch at 1724 for C=O stretch.