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

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

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

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

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