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ORGANIC CHEMISTRY PRACTICE EXAM

Total questions: 55

Worksheet time: 30mins

Name
Class
Date
1.

Which one of the following is an example for reducing sugar

a)

sucrose

b)

glucose

c)

starch

d)

cellulose

2.
What is the general formula of the alkynes?
a)
CnH2n+1
b)
CnH2n+2
c)
CnH2n-1
d)
CnH2n-2
3.

What is the parent name of this structure?

a)

nonane

b)

pentane

c)

heptane

d)

cyclohexane

4.

What is the prefix used when referring to ring structures?

a)

Pyro-

b)

Aro-

c)

Cyclo-

d)

None of the above

5.

What is the common name for alkyl branch A in the image?

a)

sec-butyl

b)

propyl

c)

neopentyl

d)

isopropyl

6.

What is the common name given to this alkyl branch?

a)

Propyl

b)

Methyl

c)

Isopropyl

d)

Ethane

7.

Which of the following is the most saturated hydrocarbon?

a)

Alkanes

b)

Alkenes

c)

Alkynes

d)

Arenes

8.

Triple bonded carbons are called ________.

a)

Alkanes

b)

Alkenes

c)

Alkynes

d)

Arenes

9.

Single bonded carbons are called _________.

a)

Alkanes

b)

Alkynes

c)

Alkenes

d)

Arenes

10.

Erlenmeyer flask is primarily used in distillation. Stirring rod is used to guide liquid when transferring it to other container.

a)

First statement is true, second statement is false

b)

Both statements are true

c)

First statement is false, second statement is true

d)

Both statements are false

11.

What is the structure of methyl alcohol?

a)

H2C=CH2

b)

CH3OH

c)

CH3CH2CH2CH3

d)

CHCl3

12.

Which term describes the formation of acetic acid from ethyl alcohol?

a)

addition

b)

esterification

c)

netralization

d)

oxidation

13.

Which physical property of compounds are you taking advantage of when purifying a liquid mixture by distillation?

a)

Melting point

b)

Boiling point

c)

Freezing point

d)

Sublimation point

14.

Which of the following purification methods involves heating the compound and allowing it to go directly from the solid phase to the gas phase, followed by condensation of the pure compound back to a solid upon cooling?

a)

Recrystallization

b)

Sublimation

c)

Chromatography

d)

Distillation

15.

Which of the following has the highest boiling point?

a)

CH3CH2CH2CO2H

b)

CH3CH2CH2CHO

c)

CH3CH2COCH3

d)

CH3CH2CO2CH3

16.

Which of the following has the highest boiling point?

a)

CH3CH2CH2CH2CH3

b)

CH3CH2CH2CHO

c)

CH3CH2CH2CH2OH

d)

A. CH3CH2OCH2CH3

17.

What are the 4 main types of organic compounds?

a)

carbon, hydrogen, sodium, fats

b)

carbohydrates, lipids, protein and nucleic acid

c)

fats, glycerol, wax, fructose

d)

monosaccharides, disaccharides, polysaccharides and oligosaccharides

18.

Which of the following alkyl halides would you expect to give the highest yield of substitution product with CH3CH2O-Na+ ?

a)

b)

c)

d)

None of them will give substitution products

19.

The correct IUPAC name for the following compound is:

a)

(1R, 3R)-1-chloro-3-methylcyclohexane

b)

(1R, 3S)-1-chloro-3-methylcyclohexane

c)

(1S, 3S)-1-chloro-3-methylcyclohexane

d)

(1S, 3R)-1-chloro-3-methylcyclohexane

20.

What is the relationship between the two compounds?

a)

enantiomers

b)

diastereomers

c)

structural isomers

d)

identical

21.

Which of the following alkyl halides would you expect to undergo a reaction with water in acetone most rapidly?

a)

b)

c)

d)

They will give same yield of substitution products

22.

What is the expected product of the following reaction sequence?

a)

b)

c)

d)

23.

What compound did Friedrich Wöhler synthesize to disprove Vitalism?



a)

A. Benzene

b)

B. Methane

c)

C. Urea

d)

D. Protein

24.

Which chemist's experiment is most associated with disproving Vitalism?

a)



A. Friedrich Wöhler

b)

B. Dmitri Mendeleev

c)

C. Antoine Lavoisier

d)

D. Archibald Couper

25.

IUPAC name of Ciprofloxacin

a)

1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7(1-piperazinyl)-3-quinolone carboxylic acid

b)

1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7(1-Pyrrolidinyl)-3-quinolone carboxylic acid

c)

1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7(1-piperazinyl)-3-quinolone carboxylic acid

d)

1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7(1-piperazinyl)-3-quinolone carboxylic acid

26.

Isoniazid inhibits the mycolic acid synthesis by acting on which enzyme ?

a)

DNA dependent RNA Polymerase

b)

DNA gyrase

c)

Mycolase synthatase

d)

RNA polymerase

27.

Pyrimethamine has the following IUPAC name:

a)

2, 4-diamino-6-ethyl-5-(p-chlorophenyl) pyrimidine

b)

2, 4-diamino-6-ethyl-5-(p-chlorophenyl) pyridine

c)

2, 4-diamino-6-ethyl-5-(m-chlorophenyl) pyrimidine

d)

2, 4-diamino-6-ethyl-5-(o-chlorophenyl) pyrimidine

28.

Which below is the general structural formula for hydroxyl group?

a)
b)
c)
d)
29.

Classify the compound based on the functional group present.

a)

a. ketone

b)

b. alcohol

c)

c. carboxyl

d)

d. aldehyde

30.

Which compound is a structural isomer of Z-but-2-ene?

a)

butane

b)

E-but-2-ene

c)

cyclobutane

d)

methylbut-2-ene

31.

Used to separate a dissolved solid from its solution

a)

Filtration

b)

Evaporation

c)

Crystallisation

d)

Sublimation

32.

What is the name of this separation technique?

a)

distillation

b)

filtration

c)

evaporation

d)

chromatography

33.

What is the name of this separation technique?

a)

Simple distillation

b)

Fractional distillation

c)

Boiling

d)

Evaporation

34.

What is the function of degasser?

a)

To add gas into the system of HPLC

b)

To prevent gas into the system of HPLC

c)

To change liquid into gas

d)

To change gas into liquid

35.

Which of these techniques is often considered a suitable "polishing" step in a protein purification strategy?

a)

Affinity chromatography (AC)

b)

Ion-exchange chromatography (IEX)

c)

Hydrophobic interaction chromatography (HIC)

d)

Size-exclusion chromatography (SEC)

36.

What is the starting point for selection of a suitable IEX matrix for purification of a recombinant protein?

a)

Prediction of isoelectric point (pI) from the amino acid sequence

b)

Test protein binding to an IEX matrix at a range of pHs and salt concentrations

c)

Test protein binding to a selection of anion and cation exchange matrices

d)

Pass your sample through a preparative column and elute with a salt gradient

37.

What type of chromatography is depicted by the illustration?

a)

Gel Filtration Chromatography

b)

Column Chromatography

c)

HPLC

d)

Thin Layer Chromatography

38.
In Chromatography the retardation factor Rf are used for identification of components. A high  Rf and a low Rt (retention time) mean the component has a 
a)
greater affinity to the stationary phase in both TLC and HPLC.
b)
greater affinity to the stationary phase in TLC but a greater affinity for the mobile phase in HPLC
c)
greater affinity to the mobile phase in TLC but a greater affininty for the stationary phase in HPLC
d)
greater affinity to the mobile phase in  both TLC  and HPLC
39.

Which of the following spectroscopy techniques is associated with molecular emission?

a)

UV-Visible spectroscopy

b)

IR spectroscopy

c)

Fluorescence spectroscopy

d)

X-ray diffraction

40.

What is the purpose of High Performance Liquid Chromatography in pharmaceutical industries?

a)

To make a cupcake.

b)

To Separate the solvent from the sample

c)

separation of compounds

d)

To detect the presence of something in compounds.

41.

What is the mechanism for HPLC?

I. The mobile phase

II. Auto sampler

III. Atomizer

IV. UV detector

a)

I, II

b)

III, IV

c)

III

d)

IV

42.

Which one of these that is not the common detector in HPLC?

a)

Infra Red

b)

Ultraviolet light

c)

Flourescent

d)

Mass Spectroscopy

43.

Which one of these do not associate with the HPLC component?

a)

UV detector

b)

Pump

c)

Degasser

d)

Atomizer

44.
What two properties affect the Rt of a compound?
I Size/weight
II Polarity
III melting point
a)
I only
b)
II only
c)
III only
d)
I and II
45.
Which of the following can be used to find the concentration of a substance in HPLC
a)
Rf value
b)
Rt value
c)
peak area
d)
peak width
46.

Also known as Emission Spectrochemical Analysis and is the original scientific method of charting and analyzing the chemical properties of matter.

a)

Chromatographic Analysis

b)

Spectra Analysis

c)

Spectrum analysis

d)

Spectro analysis

47.

Increase in the intensity of absorp in UV-Visible spectrum is called

a)

Hypsochromic

b)

Bathochromic

c)

Hyperchromic

d)

Hypochromic

48.

Which of the following shift leads to the decreased intensity of absorption?

a)

Hypochromic

b)

Hyperchromic

c)

Hypsochromic

d)

Bathochromic

49.

Which of the following is not an auxochrome group?

a)

–OH

b)

–SH

c)

–OR

d)

–O2

50.

Which electromagnetic waves have the shortest wavelengths and highest frequencies?

a)

Gamma Rays

b)

Radio Waves

c)

X-Rays

d)

Ultraviolet Rays

51.

Which of the following is NOT true for electromagnetic waves?

a)

they consist of changing electric and magnetic fields

b)

they transport energy

c)

they can be reflected

d)

they travel at different speeds in vacuum, depending on their frequency

52.

Which of the following alkyl halides would undergo SN2 reaction most rapidly?

a)

CH3CH2-Br

b)

CH3CH2-Cl

c)

CH3CH2-I

d)

CH3CH2-F

e)

they react at the same rate

53.

What is the expected product of the following reaction sequence?

a)

b)

c)

d)

54.

Wavelength range corresponding to UV - visible region is

a)

400-800 nm

b)

2.5 μm\mu m - 5.3 μm\mu m

c)

200-800 nm

d)

3.6 μm\mu m - 1nm

55.
Which of the following pairs of substances may best be separated through distillation
a)
 sand and soil
b)
water and soil
c)
salt and sand
d)
 water and alcohol

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