Question

IUPAC name and degree of unsaturation of compound X is

A. 2, 3-dimethyl bicyclo [2,2,1] hept-5 ene, 2
B. 1, 2-dimethyl bicyclo [2,2,1] hept-4 ene , 3
C. 5, 6-dimethyl bicyclo [2,2,1] hept-2 ene, 3
D. 4, 5-dimethyl bicyclo [2,2,1] hept-1 ene, 2

Answer 1

Correct Answer - C

IUPAC name = 5, 6 -dimethyl bycyclo [2, 2, 1] hept-2-ene Molecular formula of compound is `C_(9)H_(14)`.
Degree of unsaturation can be calculated as
`u = (C+1)-(H)/(2)+(N)/(2)`
where, u = degree of unsaturation
C=number of carbons
H=number of hydrogen
N = number of nitrogen
Hence, for a compound having molecular formula `C_(9)H_(14)` the degree of unsaturation may be calculated as
`u = (9+1)-(14)/(2) = 10-7=3`