Which will occur at a larger wavenumber? 1. a CC stretch or a C==C stretch 2. a

Question:

Which will occur at a larger wavenumber?
1. a C≡≡C stretch or a C==C stretch
2. a C--H stretch or a C--H bend
3. a C--N stretch or a C==N stretch
b. Assuming that the force constants are the same, which will occur at a larger wavenumber?
1. a C--O stretch or a C--Cl stretch
2. a C--O stretch or a C--C stretch