A) Types of amines
Depending upon the number of hydrogen atoms that are replaced by an alkyl or aryl group in ammonia, amines are classified as primary
(1∘), secondary
(2∘) and tertiary
(3∘).
If only one hydrogen atom is replaced then amines of the form
R−NH2 or primary amines
(1∘) are obtained.
If two of the three hydrogen atoms are replaced by alkyl/aryl groups then secondary amines
(2∘) are formed.
If all the three hydrogen atoms are replaced by alkyl/aryl group then
tertiary amines(3∘) are obtained.
Classification of the given amines compound
N atom is directly connected with only one
C atom
(i.e. one aryl group), so it is a primary amine
B) Types of amines
Depending upon the number of hydrogen atoms that are replaced by an alkyl or aryl group in ammonia, amines are classified as primary
(1∘), secondary
(2∘) and tertiary
(3∘).
If only one hydrogen atom is replaced then amines of the form
R−NH2 or primary amines
(1∘) are obtained.
If two of the three hydrogen atoms are replaced by alkyl/aryl groups then secondary amines
(2∘) are formed.
If all the three hydrogen atoms are replaced by alkyl/aryl group then
tertiary amines(3∘) are obtained.
Classification of the given amines compound

In this compound
N atom is directly connected with
3 carbon atoms
(i.e. one aryl and 2 alkyl group). So, it is a tertiary amine.
C) Types of amines
Depending upon the number of hydrogen atoms that are replaced by an alkyl or aryl group in ammonia, amines are classified as primary
(1∘), secondary
(2∘) and tertiary
(3∘).
If only one hydrogen atom is replaced then amines of the form
R−NH2 or primary amines
(1∘) are obtained.
If two of the three hydrogen atoms are replaced by alkyl/aryl groups then secondary amines
(2∘) are formed.
If all the three hydrogen atoms are replaced by alkyl/aryl group then
tertiary amines(3∘) are obtained.
Classification of the given amines compound
(C2H5)2CHNH2
N atom is directly connected with only one
C atom
(i.e. one alkyl group). So, it is a primary amine.
D) Types of amines
Depending upon the number of hydrogen atoms that are replaced by an alkyl or aryl group in ammonia, amines are classified as primary
(1∘), secondary
(2∘) and tertiary
(3∘).
If only one hydrogen atom is replaced then amines of the form
R−NH2 or primary amines
(1∘) are obtained.
If two of the three hydrogen atoms are replaced by alkyl/aryl groups then secondary amines
(2∘) are formed.
If all the three hydrogen atoms are replaced by alkyl/aryl group then
tertiary amines(3∘) are obtained.
Classification of the given amines compound
(C2H5)2NH
In structure, we can clearly see that
N is directly connected with
2 carbon atoms
(i.e. 2 alkyl group). So, it is a secondary amine.
