Exam (elaborations)

Chem 210 Exam 3 Questions and Correct Answers, With Complete Solution.

6 views 0 purchase

Course
Chem 210

Institution
Chem 210

[Show more]

Preview 2 out of 8 pages

View example

Uploaded on March 28, 2024
Number of pages 8
Written in 2023/2024
Type Exam (elaborations)
Contains Questions & answers

chem 210 exam 3 questions and correct answers wit

ACADEMICSTORE

Member since 7 months 17 documents sold

CA$14.50

Added

Add to cart

Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

Chem 210 Exam 3 Questions and Correct Answers,
With Complete Solution.

what face of the pi bond can EAR occur from?
either face
how many products do EARs on an alkene form?
4 stereoisomeric products
Brainpower
Read More
in a substitution rxn, what does H-O act as?
nucleophile and replaces LG
in an elimination rxn, what does H-O acts as?
base and abstracts BH atom
what is a requirement for elimination rxns?
beta hydrogen
what is a requirement for substitution rxns?
leaving group
what is a nucleophile?
electron pair donor- compound using its e- pair to attack another compound
what is an electrophile?
electron pair acceptor - compound being attacked
nucleophiles can become compounds with:
non bonding e- pairs and pi bonds
electrophiles can be compounds with:
open shell atoms and atoms with partial positive charges
substitution rxn:
exchanges one sigma bond for another
elimination rxn:
breaks two sigma bonds to make a pi bond
TS of Sn2 rxn:
sigma bond breaking and sigma bond forming occur simultaneously
how do Sn2 rxns effect configuration
inversion
Sn1 rxn:
multi step: carbocation intermediate, nucleophile attacks C+ (sp2 w empty p orbital)
from either side
E2 rxn:
BH atom and LG prefer to be anti staggered (Newman projection)
tBUO-
strong base, weak nucleophile

, more stable chair conformation:
LG equatorial, BH anti
E1 rxn:
BH atom and LG do not need to be anti, rxn proceeds via C+. LG leaves to form C+,
base attacks BH to form new pi bond
what rxns proceed via the same C+?
Sn1 and E1, products will always be formed together as racemic mixtures!
what is steric hindrance?
the prevention of a reaction at a particular location in a molecule by substituent groups
around the reactive site.
primary C+
no SN1 or E1, but SN2
secondary C+
SN2/E2
tertiary C+
no SN2, SN1/E1 preferred
what is the strength of a nucleophile based on?
charge & polarizability
what does nucleophilicity increase with?
decreased electronegativity and when going down a group
what is a good base?
1. strong bases with pka of CA > 30
2. sterically hindered bases with pka CA > 10
DBU:

predictive model- reagent is nucleophile only
pkaCA<15 (Cl-, Br-, I-, CN-, RS-) & uncharged sp3 hybridized atoms with lone pairs
predictive model- reagent is base only
pkaCA>30 (H-, H3C-, H2N-) & sterically hindered bases w pkaCA>10
predictive model- reagent is strong nuc and strong base
ex: (HO-, H3CO-, H3C-H2C-O-)
predictive model- reagent is weak nuc and weak base
SN2 and E2 rxns dont occur (ex: H2O, R-OH)
SN2 rxn rate
kelectrophilenucleophile
E2 rxn rate
kelectrophilebase

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICSTORE. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$14.50. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

75632 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling

Exam (elaborations)

Chem 210 Exam 3 Questions and Correct Answers, With Complete Solution.

Document information

Subjects

Written for

Seller

Reviews received

Content preview