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How to pass the introduction to organic chemistry?
Organic chemistry is the area of chemistry that involves the study of carbon and its compounds. Carbon is now known to form a seemingly unlimited number of compounds. The uses of organic compounds impact our lives daily in medicine, agriculture, and general life.

Organic Chemistry Questions

The Covalent Bond

1. The hybridization of the central carbon in CH

CN and the bond angle CCN are

a. sp 2 , 180°. b. sp, 180°. c. sp 2 , 120°. d. sp 3 , 109°.

2. Which of the following statements about an sp hybridized carbon is FALSE?

a. It is divalent. b. It forms bonds that are linear. c. It has two p orbitals. d. It always forms triple bonds to carbon.

3. Which molecule has the largest dipole moment?

a. HCl b. CCl 4 c. H 2 S d. CO 2

4. What are the hybridizations of carbons 1 and 2 respectively in the following structure?

a. sp 3 and sp 2 b. sp 2 and sp 3 c. sp 3 and sp d. sp 2 and sp 2

5. What are the hybridizations of atoms 1 and 2 respectively in the following structure?

a. sp 3 and sp 2 b. sp 2 and sp 3 c. sp 3 and sp d. sp 2 and sp 2

6. Identify the orbital hybridization at the two indicated carbons in the molecule below.

a. C 1 : sp; C 2 : sp b. C 1 : sp 2 ; C 2 : sp 2 c. C 1 : sp; C 2 : sp 2 d. C 1 : sp 2 ; C 2 : sp

7. How many total resonance structures can be drawn for the following anion (include

those without separation of charge)? a. 1 b. 2 c. 3 d. 4

8. How many resonance structures can be drawn for the following molecule?

a. 1 b. 4 c. 3 d. 2

9. The correct geometry around oxygen in CH

3 OCH 3 is a. linear. b. bent. c. tetrahedral. d. trigonal planar

10. Determine the relationship between the two molecules shown.

a. constitutional isomers b. enantiomers c. diastereomers d. identical molecules

11. What is the correct name for this molecule?

a. (2R,3R)-2-bromo-3-chlorobutane b. (2S,3R)-2-bromo-3-chlorobutane c. (2S,3S)-2-bromo-3-chlorobutane d. (2R,3S)-2-bromo-3-chlorobutane

12. What is the specific rotation 20[Į ]

D of the following molecule? a. +4.42 o b. +0.442 o c. +44.2 o d. - 44.2 o

13. Which of the following physical properties differ for each of a pair of enantiomers?

a. solubility in ethanol b. direction of rotation of plane-polarized light c. boiling point and melting point d. index of refraction

14. Determine the double bond stereochemistry (E or Z) for the following molecules.

a. A: E; B: E b. A: Z; B: Z c. A: E; B: Z d. A: Z; B: E

15. Determine the double bond stereochemistry (E or Z) for the following molecules.

a. A: E; B: E b. A: Z; B: Z c. A: E; B: Z d. A: Z; B: E

Molecular Structure and Spectra

1. A strong signal at 1700 cm

-1 in an IR spectrum indicates the presence of a(n) a. alcohol b. ether c. carbonyl d. amine

2. A strong signal at 3400 cm

-1 in an IR spectrum indicates the presence of a(n) a. alcohol b. ether c. carbonyl d. amine

3. Deduce the structure of an unknown compound with molecular formula C

5 H 12

O using

information given by its infrared spectrum.

Intensity (peak): Frequency (cm

-1 m 3300 m 2900 m 2800 m 1465 m 1450 m 1375 a. b. c. d.

4. Deduce the structure of an unknown compound with molecular formula C

9 H 10

O using

information given by its infrared spectrum.

Intensity (peak): Frequency (cm

-1 s 3100 m 2900 m 2800 s 1710 m-w 1600 m-w 1475 m 1465 m 1450 m 1375 a. b. c. d.

5. Deduce the structure of an unknown compound with molecular formula C

5 H 8

O using

information given by its infrared spectrum.

Intensity (peak): Frequency (cm

-1 m 3100 m 2800 s 1705 m-w 1640 m 1450 m 1375 a. b. c. d.

6. Which of the following compounds a-d has an IR absorption at 3300 cm

-1 a. a b. b c. c d. d

7. When an external magnetic field is applied, what happens to the protons in a sample?

a. All protons align with the field. b. All protons align opposite to the field. c. Some protons align with the field and some align opposite to it. d. All protons assume a random orientation

8. Which of the following compounds has the MOST deshielded protons?

a. CH 3 Cl b. CH 3 I c. CH 3 Br d. CH 4

9. Arrange the following compounds in order of decreasing chemical shift for the

underlined hydrogens (largest value first, smallest value last). CH 3 CH 2 CH 3 CH 3 OCH 2 CH 3 Cl 2 CHCH 2 CH 3 ClCH 2 CH 2 CH 3 a b c d a. b > c > a > d b. b > c > d > a c. c > b > a > d d. c > b > d > a

10. An unknown molecule A has 4 signals in the

H NMR spectrum. Which of the

following corresponds to molecule A? a. b. c. d.

11. Deduce the structure of an unknown compound using the following

1 H NMR spectrum, mass spectroscopy data, and IR spectrum. 1

H NMR spectrum:

1.30 (triplet, 6H)

quotesdbs_dbs12.pdfusesText_18

[PDF] [PDF] General Organic Chemistry Questions

What are the questions for organic chemistry?

How to pass the introduction to organic chemistry?

Organic Chemistry Questions

The Covalent Bond

1. The hybridization of the central carbon in CH

CN and the bond angle CCN are

2. Which of the following statements about an sp hybridized carbon is FALSE?

3. Which molecule has the largest dipole moment?

4. What are the hybridizations of carbons 1 and 2 respectively in the following structure?

5. What are the hybridizations of atoms 1 and 2 respectively in the following structure?

6. Identify the orbital hybridization at the two indicated carbons in the molecule below.

7. How many total resonance structures can be drawn for the following anion (include

8. How many resonance structures can be drawn for the following molecule?

9. The correct geometry around oxygen in CH

10. Determine the relationship between the two molecules shown.

11. What is the correct name for this molecule?

12. What is the specific rotation 20[Į ]

13. Which of the following physical properties differ for each of a pair of enantiomers?

14. Determine the double bond stereochemistry (E or Z) for the following molecules.

15. Determine the double bond stereochemistry (E or Z) for the following molecules.

Molecular Structure and Spectra

1. A strong signal at 1700 cm

2. A strong signal at 3400 cm

3. Deduce the structure of an unknown compound with molecular formula C

O using

Intensity (peak): Frequency (cm

4. Deduce the structure of an unknown compound with molecular formula C

O using

Intensity (peak): Frequency (cm

5. Deduce the structure of an unknown compound with molecular formula C

O using

Intensity (peak): Frequency (cm

6. Which of the following compounds a-d has an IR absorption at 3300 cm

7. When an external magnetic field is applied, what happens to the protons in a sample?

8. Which of the following compounds has the MOST deshielded protons?

9. Arrange the following compounds in order of decreasing chemical shift for the

10. An unknown molecule A has 4 signals in the

H NMR spectrum. Which of the

11. Deduce the structure of an unknown compound using the following

H NMR spectrum:

1.30 (triplet, 6H)