Can someone PLEASE help me with this practice test so I can study for my exam???
ID: 968461 • Letter: C
Question
Can someone PLEASE help me with this practice test so I can study for my exam???
I can't upload images on chegg for some reason but i've attached the images of the questions.
QUESTIONS 47-49 -> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/9275e05.png
QUESTIONS 50-53 -> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/92da04f.png
QUESTIONS 54-55-> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/942957d.png
QUESTIONS 56-58 -> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/93316da.png
QUESTIONS 59-61 -> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/93e0ed9.png
QUESTIONS 62-64 -> (COPY & PASTE onto another browser window please!)
https://i.imgsafe.org/95d38eb.png
Explanation / Answer
You have to many questions in a same post. I will answer the first two. The others post them in another question thread and per separate:
47.
a nucleophile is a species that donates a pair of electrons to form a new covalent bond. Nucleophilicity is measured by comparing reaction rates; the faster the reaction, the better (or, “stronger”) the nucleophile.
When discussing nucleophilicity we’re specifically talking about donating a pair of electrons to an atom other than hydrogen (usually carbon). When a species is donating a pair of electrons to a hydrogen (more specifically, a proton, H+) we call it a base.
This post attempts to address one of the most vexing question to students of organic chemistry.What are the factors that make a good nucleophile?
For our purposes, there are at least four key factors contributing to nucleophilicity.
Now in this question, and following the above, the best nucleophile will be the ethoxide ion.
48. In a substitution, (Sn1 or Sn2) you always substitute one atom for another. In this case, the substitution will be the Br for the OH. So the correct option would be C.
49. In this part, the bulkiness will be the one that determines the slowest. In this case, Option C would be the slowest.
50. The best leaving group will be the fastest, and between Br and I, the I is a better leaving group (a bigger atom than Br), and the OH is one of the best nucleophile, so option B is the correct option.
51. The F is not a great leaving group, because of the size of it's atom. So option E would be the slowest.
52. As I said in 50, the best leaving group is I.
53. The CH3CH2I is most reactive to SN2.
Hope this helps