The given pairs of compounds have to be distinguished using IR spectroscopy Concept Introduction : IR spectra occur due to the change in dipole moment values between the two atoms. In the IR spectra, primary and secondary amines show signals between 3350 and 3500 cm −1 . These signals match with N−H stretching. Primary amines give two peaks (symmetric and asymmetric stretching) while secondary amines give only one peak . Tertiary amines lack an N−H bond and do not exhibit a signal in the region between 3350 and 3500cm −1 . Tertiary amines can be detected with IR spectroscopy by treatment with HCl. The resulting N−H bond of ammonium salt exhibits a characteristic signal between 2200 and 3000cm −1 . To find: Distinguish the given pairs of compounds using IR spectroscopy (a) Find the nature of nitrogen bond in the given pairs (a)

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Chapter 22.13, Problem 31CC

(a)

Interpretation Introduction

Interpretation: The given pairs of compounds have to be distinguished using IR spectroscopy

Concept Introduction:

IR spectra occur due to the change in dipole moment values between the two atoms. In the IR spectra, primary and secondary amines show signals between 3350 and 3500 cm⁻¹. These signals match with N−H stretching. Primary amines give two peaks (symmetric and asymmetric stretching) while secondary amines give only one peak. Tertiary amines lack an N−H bond and do not exhibit a signal in the region between 3350 and 3500cm⁻¹. Tertiary amines can be detected with IR spectroscopy by treatment with HCl. The resulting N−H bond of ammonium salt exhibits a characteristic signal between 2200 and 3000cm⁻¹.

To find: Distinguish the given pairs of compounds using IR spectroscopy (a)

Find the nature of nitrogen bond in the given pairs (a)

(b)

Interpretation Introduction

Interpretation: The given pairs of compounds have to be distinguished using IR spectroscopy

Concept Introduction:

IR spectra occur due to the change in dipole moment values between the two atoms. In the IR spectra, primary and secondary amines show signals between 3350 and 3500 cm⁻¹. These signals match with N−H stretching. Primary amines give two peaks (symmetric and asymmetric stretching) while secondary amines give only one peak. Tertiary amines lack an N−H bond and do not exhibit a signal in the region between 3350 and 3500cm⁻¹. Tertiary amines can be detected with IR spectroscopy by treatment with HCl. The resulting N−H bond of ammonium salt exhibits a characteristic signal between 2200 and 3000cm⁻¹.

To find: Distinguish the given pairs of compounds using IR spectroscopy (b)

Find the nature of nitrogen bond in the given pairs (b)

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