Ethyne (HCCH)does Not Show IR Absorption in the Region 2000-2500

question 72

Multiple Choice

Ethyne (HCCH) does not show IR absorption in the region 2000-2500 cm^-1 because

• A)C-H stretches occur at lower energies.
• B)CC stretches occur at about 1640 cm^-1.
• C)there is no change in the dipole moment when the CC bond in ethyne stretches.
• D)there is a change in the dipole moment when the CC bond in ethyne stretches.

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Definitions:

Haworth Structure

A way of representing cyclic structures of monosaccharides in a simplified three-dimensional perspective compared to the Fischer projection.

Isomerization

A chemical process in which a molecule is transformed into another molecule with the same molecular formula but a different structural arrangement.

Reagents

Substances or mixtures used in chemical reactions to bring about a change or detect the occurrence of a specific reaction.

2-Ketohexose

A category of hexose sugars characterized by having a ketone functional group in the second position of the carbon chain.