Question

There is a total of seventeen constitutional isomers for the molecular formula C5H13N. Draw the skeletal formula of all eight constitutional isomers that are primary amines.

Answer 1

Concept and reason

The concept is to draw the eight constitutional isomers of ${{\rm{C}}_5}{{\rm{H}}_{13}}{\rm{N}}$ that are primary amines.

Fundamentals

Constitutional isomers are the isomers that have same molecular formula but differ in the connectivity of the atoms/groups.

A primary amine (1°) is an amine where the N atom is bonded to two hydrogen atoms and one carbon atom.

A secondary amine (2°) is an amine where the N atom is bonded to one hydrogen atom and two carbon atoms.

A tertiary amine (3°) is an amine where the N atom is bonded to three carbon atoms and not hydrogen atoms.

They are represented as follows:

a.

The 17 constitutional isomers of ${{\rm{C}}_5}{{\rm{H}}_{13}}{\rm{N}}$ are as follows:

The compounds in which the N is bonded to two H atoms and one carbon atom are primary amines.

The constitutional isomers of ${{\rm{C}}_5}{{\rm{H}}_{13}}{\rm{N}}$ that are primary amines are as follows:

Ans: Part a

Therefore, the constitutional isomers of ${{\rm{C}}_5}{{\rm{H}}_{13}}{\rm{N}}$ that are primary amines are