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5 MCQs with Answer Key - Organic Chemistry | CHE 255, Assignments of Organic Chemistry

University of Southern Mississippi (USM)Organic Chemistry

Material Type: Assignment; Class: Organic Chemistry; Subject: Chemistry and Biochemistry; University: University of Southern Mississippi; Term: Unknown 1989;

Typology: Assignments

Pre 2010

Uploaded on 08/19/2009

koofers-user-ehx 🇺🇸

10 documents

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Name: __________________________ Date: _____________

1. According to the Lewis definition, a base is a(n):

A) Proton donor.

B) Electron pair donor.

C) Hydroxide ion donor.

D) Hydrogen ion donor.

E) Electron pair acceptor.

2. What is the conjugate base of ethanol? The structure of ethanol is CH3CH2OH.

A) CH3CH2O–

B) CH3CH2–

C) CH3CH2OH2+

D) CH3CH3

E) CH3OCH3

3. Which of the acids below would have the strongest conjugate base?

A) CH3CH2OH pKa = 18

B) CH3CO2H pKa = 4.75

C) ClCH2CO2H pKa = 2.81

D) Cl2CHCO2H pKa = 1.29

E) Cl3CCO2H pKa = 0.66

4. Which of the following organic compounds is the strongest acid?

A) C6H12 pKa = 52

B) CH3CH3 pKa = 50

C) CH3CH2OH pKa = 18

D) CH3CO2H pKa = 5

E) CF3CO2H pKa = 0

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Download 5 MCQs with Answer Key - Organic Chemistry | CHE 255 and more Assignments Organic Chemistry in PDF only on Docsity!

Name: __________________________ Date: _____________

According to the Lewis definition, a base is a(n): A) Proton donor. B) Electron pair donor. C) Hydroxide ion donor. D) Hydrogen ion donor. E) Electron pair acceptor.
What is the conjugate base of ethanol? The structure of ethanol is CH 3 CH 2 OH. A) CH 3 CH 2 O– B) CH 3 CH 2 – C) CH 3 CH 2 OH 2 + D) CH 3 CH 3 E) CH 3 OCH 3
Which of the acids below would have the strongest conjugate base? A) CH 3 CH 2 OH pKa = 18 B) CH 3 CO 2 H pKa = 4. C) ClCH 2 CO 2 H pKa = 2. D) Cl 2 CHCO 2 H pKa = 1. E) Cl 3 CCO 2 H pKa = 0.
Which of the following organic compounds is the strongest acid? A) C 6 H 12 pKa = 52 B) CH 3 CH 3 pKa = 50 C) CH 3 CH 2 OH pKa = 18 D) CH 3 CO 2 H pKa = 5 E) CF 3 CO 2 H pKa = 0

Hydrogen atom(s) from which position(s) is (are) most likely to be abstracted when the following substance is treated with NaH?

1 2 3

6 7

10 9

A) 1

B) 1, 5, 6

C) 1, 2

D) 3, 4, 7, 8, 9, 10

E) Hydrogens from all of the positions are equally likely to be abstracted by NaH.