WBJEE 2013 Chemistry Solved Paper

Degree of unsaturation =

Σn(v−2)

2

+1
n = no. of atoms of a particular type
v = valency of the atom
C7H9O ; DU = + 1 = 3.5
C8H12O ; DU = + = 3
C6H11O ; DU = = 1.5
C10H17O2 ; DU = + 1 = 2.5
Molecules with fractional degr e of unsaturation cannot exist with stability