What is the condensed structural formula of N-ethyl-N­-propylpentylammonium bromide? Is it a salt of a primary, secondary, or tertiary amine?

• A. It is an ammonium salt of a primary amine.
• B. It is an ammonium salt of a secondary amine.
• C. It is an ammonium salt of a tertiary amine.
• D. It is an ammonium salt of a tertiary amine.

Answer: (D)