BSc Chemistry

Which of the following absorption peak or peaks would be most useful for identifying the compound diethylamine?

• Medium stretch from 3500 to 3300 cm^-1

• Sharp peak at 1750 cm^-1

• Two medium peaks, one at 3300 cm^-1 and 3400 cm^-1

• Very broad stretch from 3500 to 2500 cm^-1

On which factors the vibrational stretching frequency of diatomic molecule depend?

• Force constant

• Atomic population

• Temperature

• Magnetic field

A reaction is second order with respect to the reactant. How is the rate of reaction affected if the concentration of the reaction is "doubled"?

Based on the absorption spectrum, what is the likely name of the compound in the image?

• butanoic acid

• Pentanol

• diethylamine

• aniline

What is the relation between restoring force, f to the displacement q in Hooke’s law?

• f = -kq

• f = kq

• f = kq²

• f = -kq²

Listen the audio and answer the question.

• Stretching frequencies appear mostly in the fingerprint region

• Stretching frequencies are lower than corresponding bending frequencies.

• Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.

• Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.

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Formaldehyde is

• CH3CHO

• HCHO

• C6H5CHO

• NONE OF THESE

Identify the compound

• Toluene

• Benzaldehyde

• Benzoic Acid

• None of these