Compound e has a molecular formula of c7h6o3. what is the unsaturation number (un) or double-bond equivalent (dbe) ?

Unsaturation number (un) or double bond equivalent (dbe) can be calculated as:

=C+1 - (H/2)

Where C=number of carbon atoms

H=number of hydrogen atoms

So here the compound is C7H6O3

C=7

H=6

Presence of oxygen will not affect the DBE.

So DBE = 7+1 - (6/2)

=5