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Instrumentation and Working Principles of Solutions Infra Red (IR) Spectroscopy

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1. In IR spectroscopy, the vibration between atoms is caused by which of the following?

a: The overall molecular weight of the molecule Explanation

Explanation

b: Dipole moments between atoms Explanation

Explanation

c: The movement of electrons to higher energy levels Explanation

Explanation

d: The number of protons in a nucleus Explanation

Explanation

2. Which of the following functional groups exhibits the highest frequency in an infrared (IR) spectrum?

a: Alcohol Explanation

Explanation

b: Ester Explanation

Explanation

c: Ketone Explanation

Explanation

d: Aldehyde Explanation

Explanation

3. An unknown compound is analyzed using infrared spectroscopy. A strong, sharp peak is observed at a frequency of 1750cm^-1. What functional group is present?

a: Ester Explanation

Explanation

b: Saturated ketone Explanation

Explanation

c: Unsaturated ketone Explanation

Explanation

d: Alcohol Explanation

Explanation

4. Which of the following molecules interferes with the recorded IR spectra when recorded in air?

a: N₂ Explanation

Explanation

b: O₂ Explanation

Explanation

c: CO₂ Explanation

Explanation

d: None of the above Explanation

Explanation

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