Organic Chem Questions (1 Viewer)

[erucibon]

1) Explain the reaction of an amine and water in terms of Lewis and Bronsted/Lowry theories.
Also, what are the general points you would talk about when asked to refer to Lewis and Bonsted/Lowry in organic chem?

2) How can you convert ethene to a secondary amid without hydration or alkane formation?

3) Account for differences in boiling points of butanone and butan-1-ol in terms of intramolecular characteristics and intermolecular bonding.
I understand the intermolecular bonding part (presence of hydrogen bonding), but not sure how intramolecular can affect boiling point.


Thanks

 

[jazz519]

1) give an equation (best to draw a diagram equation because that will show the Lewis acid bit easier) ch3nh2 + h2o <—> ch3nh3+ + oh-
Define Brønsted Lowry: reactions that involve proton transfer. Acid is a proton donor. Base is a proton acceptor. The equation links with that as h2o donates proton (acid) and ch3nh2 accepts proton (base).
define Lewis theory: involves the transfer of an electron pair. Lewis acid is an electron pair acceptor. Lewis base is an electron pair donator. (So you can show in your diagram equation that the nitrogen on the amine donates an electron pair to the H in water when it forms ch3nh3+)

2) this q is kind of pointless because they will always allow you to use those reaction forms since it’s in the syllabus.

But for the question I guess here’s the answer:
Doing an addition reaction with Hcl to make chloroethane. Then do a reaction with nh2 substitution to make ethanamine. React that with any carboxylic acid and you get your secondary amide

3) it means by the intramolecular bonds what causes the hydrogen bonding. It’s the presence of the OH intramolecular bond in the alcohol which is not present in the ketone