We’re being asked to determine the index of hydrogen deficiency (IHD) for C5H6F3N.
Recall that the degrees of unsaturation or index of hydrogen deficiency (IHD) tell us how many hydrogens are missing in a structure.
For a given molecular formula, the IHD is calculated using:
where n = number of carbons and H is:
• +1 for hydrogen (H) or halogens (X)
• 0 for oxygen (O)
• –1 for nitrogen (N)
How many degrees of unsaturation are in a compound with the formula C5H6F3N?