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Question 17.4.4: Give the characteristic absorption bands in the infrared spe......

Give the characteristic absorption bands in the infrared spectrum of benzaldehyde.

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• A band at 3080 \mathrm{cm}^{–1} due to C–H stretching of benzene ring.

• Bands at 2680 \mathrm{cm}^{–1} and 2780 \mathrm{cm}^{–1} due to C–H str. of an aldehyde group

• A band at 1700 \mathrm{cm}^{–1} due to C \xlongequal[]{} O str. of an aromatic benzene ring.

• Bands at 745 \mathrm{cm}^{–1} and 685 \mathrm{cm}^{–1} due to C–H bending of monosubstituted benzene.

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