need some help

1. Hooke's law dictates that IR stretching frequencies are dependent on a. Bond strength and molar masses of the atoms b. The number of lone pairs and dipole moment of the bond c. The effective nuclear charge and polarizability of the bond d. The magnetic spin and hybridization of the atoms 2. Keeping all other variables the same, in IR spectroscopy, as bond strength decreases, a. Wavenumber of the IR stretch decreases b. Wavenumber of the IR stretch increases c. Wavelength and wavenumber of the IR stretch decrease d. Wavelength of the IR stretch decreases 3. Keeping all other variables the same, which of the following bonds would have the lowest R R stretching frequency? a. C-N b. C-Cl c. C-O d. C-H 4. Which of the following is in correct order of decreasing IR stretching frequency? a. Alkynes > alkenes > alkanes b. Alkanes > alkynes > alkenes c. Alkenes > alkynes > alkanes d. Alkynes > alkanes > alkenes 5. In order for an IR vibration to be allowed, what condition must be met? a. There must be a change in dipole moment of the molecule. b. There must be a change in the polarizability of the molecule. c. The spin state of the molecule must flip. d. There must be a chromophoric species