Steven asks…
Which of the following is a polar aprotic solvent?
A) CCl4
B) NH3(l)
C) Diethyl ether
D) 2-methyl-2-propanol
E) 2-methylhexane
My line of thinking was to cross out all nonpolar substances. A, C, and E are automatically out. (Hopefully the ether is nonpolar, I think they are, or at the most, very slightly polar.. oh well.)
Then I’m left with 2-methyl-2-propanol and ammonia. 2-methyl-2-propanol is slightly polar, but it may display hydrogen bonding, so it’s protic.
The ammonia is polar, and also displays hydrogen bonding, seeing as the nitrogen is highly electronegative.
Which leaves the question.. where has my logic failed?
weight loss cardiff answers:
Your logic has failed in crossing off ether! It is a bent molecule, and polar.
Mary asks…
What is the product when the following compound is oxidized?
——-OH
C-C-C-C-C
A. diethyl ketone
B. 2-pentene
C. pentanal
D. diethyl ether
E. pentane
weight loss cardiff answers:
Lol…wtf is that? 3-pentanol, right?
If it’s oxidize, you get 3-pentanone, ie. Diethyl ketone.
Linda asks…
During extraction, which of these substances would be in the top layer when added to the same container?
A. Diethyl ether/water
B. Dichloromethane/water
If you also know why, feel free to explain a little. Thanks!
weight loss cardiff answers:
Diethyl ether and Dichloromethane would be in the top layer. Both of these chemicals have poor water solubility and float on the top of the water layer. (You know, like “oil and water don’t mix.”) The top layer is also called the “oil layer” for this reason.
If you have a chemical that you want in the water layer that’s more soluble in DiEE or DCM, washing and agitating it will mix the chemicals and ‘pull out’ your desired chemical into the oil layer, trapping it there. That’s why you shake the extraction funnel so many times. Since the oil layer sits on top, later on you can allow it to settle and then just turn the stop cock and run off the water layer.
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