Organic Chemistry (Concepts)

Question 1

Part of a molecule where most of its chemical reactions occur

Answer 1

Functional group

Question 2

Which of the following alkanes is gas at
room temperature?

Answer 2

methane up to butane

Question 3

When ethyl bromide is treated with sodium
in dry ether, the product is
a. propane
b. methylpropane
c. butane
d. ethane

Answer 3

c. butane

Question 4

When 1-bromo-2-methylcyclobutane is
treated with alcoholic KOH, the dominant
product is
a. 3-methylcyclobutene
b.4-methylcyclobutene
c. 1-methylcyclobutene
d. 2-methylcyclobutene

Answer 4

C.1-methylcyclobutene

Question 5

Among the following alcohols, 2-methylpropene can be obtained from
a.1-butanol
b.2-methyl-2-propanol
c. 2-butanol
d. All of these

Answer 5

b.2-methyl-2-propanol

Question 6

Alkenes are commonly prepared via
elimination reaction, which of the following is
NOT an elimination reaction?
a. Dehydration of alcohol
b. Dehalogenation of vicinal dihalide
c. Dehydrohalogenation of alkyl halide
d. Hydrogenation of alkynes

Answer 6

d. Hydrogenation of alkynes

Question 7

The following reagents will yield an alkyl
halide from an alkene EXCEPT
a. Br2 / uv or light
b. HCl
c. Br
2 in CCl4
d. HBr / peroxide

Answer 7

a. Br2 / uv or light

Question 8

Hydrogenation of alkenes in the presence
of a poisoned palladium catalyst produces
a. alkane
b. alkyl halide
c. alkyne
d. alcohol

Answer 8

a. alkane

Question 9

When 2-butyne undergoes ozonolysis, the
main product is
a. carbon dioxide
b. acetaldehyde
c. acetic acid
d. acetone

Answer 9

c. acetic acid

Question 10

In hydration of alkynes, the enol formed is
found to transform into a ketone. This form of
isomerism is known as _____
a. geometric isomerism
b. keto-enol tautomerism
c. structural isomerism
d. positional isomerism

Answer 10

b. keto-enol tautomerism

Question 11

How many isomers does xylene have?

Answer 11

3

Question 12

Which of the following processes will yield
an aldehyde?
a. Oxidation of alcohols using KMnO4 in
basic medium
b. Ozonolysis of alkenes
c. Oxidation of alcohols using chromic acid
d. Ozonolysis of alkynes

Answer 12

b. Ozonolysis of alkenes

Question 13

Hydrogenation of one mole of allene (CH2=C=CH2) with 2 moles of H2 in the
presence of Lindlar catalyst yields:
a. propylene
b. propane
c.2-butene
d.2-propene

Answer 13

b. propane

Question 14

2-methyl-2-butene undergoes hydrochlorination in the presence of benzoyl
peroxide to form
a. 3-chloro-3-methylbutane
b. 2-chloro-3-methylbutane
c. 2-chloro-2-methylbutane
d.1-chloro-3-methylbutane

Answer 14

b. 2-chloro-3-methylbutane

Question 15

Which of the following straight-chain
alkanes can be conveniently prepared by
Wurtz reaction?
a. heptadecane
b. nonane
c. icosane
d. none of the above

Answer 15

c. icosane

Question 16

Dehydrochlorination of 2-chloro-3-methylpentane with alcoholic KOH yields
a. 3-methyl-1-pentene
b. 2-methyl-2-pentene
c. 3-methyl-2-pentene
d. 1,3-hexadiene

Answer 16

c. 3-methyl-2-pentene

Question 17

Friedel-Crafts acylation of benzene with acetyl chloride in 𝐴𝑙𝐶𝑙3 yields
a. chlorobenzene
b. cumene
c. acetophenone
d. benzaldehyde

Answer 17

c. acetophenone

Question 18

In the Grignard synthesis of an alkane
using sec-butyl bromide, which of the following
alkane will be produced?
a. n-butane
b. isopentane
c. isobutane
d. none of these

Answer 18

a. n-butane

Question 19

Sulfonation of toluene yields to
a. 2-ethylbenzenesulfonic acid
b. 2-ethylbenzenesulfonic acid
c. 3-ethylbenzenesulfonic acid
d. 3-ethylbenzenesulfonic acid

Answer 19

a. 2-ethylbenzenesulfonic acid

Question 20

Vinylbenzene is also known as _______
a. styrene
b. cumene
c. mesitylene
d. durene

Answer 20

a. styrene

Question 21

Which of the following carbonyl compounds
produce a secondary alcohol with 𝐿𝑖𝐴𝑙𝐻4?
a. aldehyde
b. ketone
c. ester
d. carboxylic acid

Answer 21

b. ketone

Question 22

Addition of methyl magnesium bromide to
acetaldehyde produces
a. ethanol
b. 1-propanol
c. methanol
d. 2-propanol

Answer 22

d. 2-propanol

Question 23

Oxidation of isopropyl alcohol with 𝐾𝑀𝑛𝑂4
will yield ___________
a. acetone
b. acetaldehyde
c. acetic acid
d. diethyl ether

Answer 23

a. acetone

Question 24

In Williamson synthesis of methyl isopropyl
ether, the alcohol used is
a. methanol
b. isopropyl alcohol
c. n-propyl alcohol
d. ethano

Answer 24

b. isopropyl alcoho

Question 25

Hydrocarbon derivatives used as a main
ingredient in automobile antifreeze
a. ethylene glycol
b. isopropyl alcohol
c. propylene
d. toluene

Answer 25

a. ethylene glycol

Question 26

A tertiary alcohol is produced using
Grignard Reagent using a/an ________
a. ketone
b. aldehyde
c. alkyl halide
d. epoxides

Answer 26

a. ketone

Question 27

Carbonyl compounds can be obtained by
reduction using the following except ______
a. ester
b. acyl chloride
c. nitrile
d. amide

Answer 27

c. nitrile

Question 28

Reaction of alcohol and a carboxylic acid is
known as ________
a. saponification
b. nuetralization
c. esterification
d. epoxidation

Answer 28

c. esterification

Question 29

An unknown ester was hydrolyzed with
water and acid to produce an acid, X and
alcohol, Y. Oxidation of the alcohol with hot
𝐾𝑀𝑛𝑂4 yielded acid X. Oxidation of the
alcohol produced acetaldehyde. Name the
ester.
a. methyl ethanoate
b. ethyl ethanoate
c. methyl propanoate
d. ethyl benzoate

Answer 29

b. ethyl ethanoate

Question 30

When an ethyl acetate is reduced by
𝐿𝑖𝐴𝑙𝐻4 the product is
a. acetic acid
b. ethanol
c. acetone
d. acetaldehyde

Answer 30

b. ethanol

Question 31

No carbonyl group is found in
a. aldehyde
b. ketone
c. ester
d. epoxide

Answer 31

d. epoxide

Question 32

Carboxylic acids are reduced by lithium
aluminum hydride to the corresponding
_________
a. primary alcohols
b. secondary alcohols
c. tertiary alcohols
d. All of these

Answer 32

a. primary alcohols