Which of the following compounds are secondary (2^$\circ$) amines?
1) (CH₃) ₃CNHCH₃
2) CH₃CH(NH₂) CH₂CH₃
3) CH₃CH₂CH₂NHCH₃
4) CH₃CH₂CH₂CH₂CH₂NH₂

Question

Quizplus · Accepted Answer

In a secondary amine, two of the substituents attached to the nitrogen atom are alkyl or aryl groups and the remaining substituent is a hydrogen atom. 
In option 1, all three substituents attached to nitrogen are alkyl groups, so it is a tertiary amine.
In option 2, two substituents attached to nitrogen are alkyl groups and one is an amide functional group (-NH-), so it is a secondary amine.
In option 3, two substituents attached to nitrogen are alkyl groups and one is a hydrogen atom, so it is a secondary amine.
In option 4, three substituents attached to nitrogen are alkyl groups and two are amide functional groups (-NH-), so it is a quaternary ammonium salt. 
Therefore, only options 2 and 3 are secondary amines. The correct choice is B, which includes only options 1 and 3 as secondary amines.

Which of the Following Compounds Are Secondary (2 ∘\circ∘ ) Amines? 1)(CH3)3CNHCH3 2)CH3CH(NH2)CH2CH3 3)CH3CH2CH2NHCH3 4)CH3CH2CH2CH2CH2NH2 A)1 and 2 B)1

Which of the Following Compounds Are Secondary (2^$\circ$) Amines?
1)(CH₃)₃CNHCH₃
2)CH₃CH(NH₂)CH₂CH₃
3)CH₃CH₂CH₂NHCH₃
4)CH₃CH₂CH₂CH₂CH₂NH₂
A)1 and 2
B)1