DAT Destroyer 2014 OChem Question #18

[urbanthread]

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Question: Which of the following is an example of a secondary amine?

How is NR3H+ a quaternary amine while NRH2 is a primary amine and not a tertiary amine?

 

[customx]

Organize your questions into one thread instead of making a new thread for every question.

Kind of hard to answer the first question without seeing a picture of the molecules.

I believe the 3 carbons attached to the Nitrogen and the + make it a quaternary amine while there is only one carbon bonded to the nitrogen in NRH2, making it a primary amine.

 

[SmileDesignersDDS]

I think that you only count the R groups attached to the nitrogen when classifying it as primary secondary tertiary or quarternary.

 

[BabyShades]

We don't count the hydrogens, for example CH4 is primary, however CH3-CH2-CH3 is secondary for the 2nd carbon.

 

[1Overdrive]

We don't count the hydrogens, for example CH4 is primary, however CH3-CH2-CH3 is secondary for the 2nd carbon.

CH4 is not the best example of a primary, even though by convention people may call it that. CH3CH3 however has two primary carbons.

 

[BabyShades]

CH4 is not the best example of a primary, even though by convention people may call it that. CH3CH3 however has two primary carbons.

You are right. It has been a while since I took the DAT.

 

[tommyngu]

Question: Which of the following is an example of a secondary amine?

How is NR3H+ a quaternary amine while NRH2 is a primary amine and not a tertiary amine?

NR3H+ would be a tertiary amine and NRH2 would be a primary amine like you said. It looks like Destroyer made an error. A quaternary amine would be NR4+