will-bond-b-of-ethyne-absorb-at-a-higher-or-lower-wavenumber-than-bond-a-of-prop

Question

Will bond b of ethyne absorb at a higher or lower wavenumber than bond a of prop-1-ene? Briefly explain.

Comparison of C-H bonds in prop-1-ene and ethyne for IR spectroscopy analysis.

Accepted Answer

Higher wavenumber; the C—H bond of an alkyne is shorter and stronger.

Answer

Higher wavenumber; the C—H bond of an alkyne is longer and weaker.

Answer

Lower wavenumber; the C—H bond of an alkyne is shorter and stronger.

Answer

Lower wavenumber; the C—H bond of an alkyne is longer and weaker.