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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