Question

What is the number of structural isomers possible for an amine with molecular formula $C_4{H}_{11}N$ ?

• A. 5
• B. 6
• C. 7
• D. 8

Answer 1

The correct option is D 8

Here,
$DOU=(4+1)-\frac{11}{2}+\frac{1}{2}DOU=0$
So, there are no $\pi$ bonds and rings

There are 8 different structural isomers possible for the compound having molecular formula $C_4{H}_{11}N$ :
1. Primary Amines:


2. Secondary amines

3. Tertiary amine

Theory :
For a compound having molecular formula $C_c{H}_h{X}_x{N}_n{O}_o$
Degree of unsaturation (DOU) :
$DOU=(c+1)-\frac{h}{2}-\frac{x}{2}+\frac{n}{2}$
where X is halogen family
N are elements of nitrogen family
O are elements of oxygen family
Presence of O atom does not affect DOU