Question

Which is the correct order of increasing wave number of the stretching vibrations of (1) C-H (alkane), (2) O-H (alcohol), (3) C=O (ketone), and (4) C≡C (alkyne)?

Answer 1

Order Should Be O-H (alcohol) > C-H (alkane) >  C≡C (alkyne) > C=O (ketone).

So , Answer Should Be 2 > 1 > 4 > 3 .