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Worksheets

8th session

Total questions: 70

Worksheet time: 35mins

Name
Class
Date
1.

What general class of compounds is also known as olefins?

a)

alkenes

b)

alkynes

c)

aromatics

d)

alkanes

2.

The simplest alkyne is .

a)

ethylene

b)

ethane

c)

acetylene

d)

propyne

3.

The melting and boiling points of hydrocarbons are determined by

a)

ion-dipole attraction

b)

dipole-dipole attraction

c)

London forces

d)

hydrogen bonding

4.

Hydrocarbons containing carbon- carbon triple bonds are called

a)

alkanes

b)

aromatic hydrocarbons

c)

alkynes

d)

alkenes

5.

The molecular geometry of each carbon atom in an alkane is .

a)

octahedral

b)

square planar

c)

trigonal planar

d)

tetrahedral

6.

The minimum number of carbons necessary for a hydrocarbon to form a branched structure is

a)

4

b)

6

c)

3

d)

9

7.

Hydrocarbons containing only single bonds between the carbon atoms are called .

a)

alkenes

b)

alkynes

c)

aromatics

d)

alkanes

8.

The general formula of an alkane is .

a)

C2nH2n+2

b)

CnH2n

c)

CnH2n+2

d)

CnH2n-2

9.

Gasoline and water do not mix because gasoline is

a)

less dense than water

b)

less viscous than water

c)

nonpolar and water is polar

d)

volatile and water is not

10.

In general,_______are the most reactive hydrocarbons

a)

alkenes

b)

alkynes

c)

alkanes

d)

cycloalkanes

11.

The general formula for an ether is

a)

R-O-R'

b)

R-CO-R'

c)

R-CO-OH

d)

R-OH

12.

Ethers can be made by condensation of two molecules by splitting out a molecule of water.

a)

alkyne

b)

alcohol

c)

ketone

d)

aldehyde

13.

The general formula of a carboxylic acid is

a)

R-O-R'

b)

R-CO-R'

c)

R-CO-OH

d)

R-H

14.

Optically active molecules that are mirror images of each other are called

a)

allotropes

b)

geometrical isomers

c)

enantiomers

d)

cofactors

15.

When petroleum is distilled to separate the components by boiling point, the component with the highest boiling point is called

a)

asphalt

b)

gasoline

c)

kerosene

d)

paraffin

16.

The large number of organic compounds is due to

a)

the valency of carbon

b)

the small size of carbon

c)

a special property of carbon known as catenation

d)

none of these

17.

The halogenation of alkanes is an example of

a)

nucleophilic substitution

b)

electrophilic substitution

c)

oxidation

d)

free-radical substitution

18.

A liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by

a)

hydrolysis

b)

oxidation

c)

distillation in vacuum

d)

cracking

19.

The most common reactions of alkenes are those of

a)

nucleophilic substitution

b)

electrophilic substitution

c)

electrophilic addition

d)

nucleophilic addition

20.

Which of the following is obtained by addition polymerization?

a)

PVC

b)

Terylene

c)

Nylon

d)

Polyamide

21.

Teflon is obtained from

a)

difluoroethene

b)

monofluoroethene

c)

tetrafluoroethene

d)

tetrafluoroethane

22.

A compound having a bond angle of 180 degrees is a/an

a)

alkane

b)

alkene

c)

cycloalkane

d)

alkyne

23.

Addition polymerization can be brought about by the following except?

a)

free radicals

b)

anions

c)

cations

d)

metals

24.

The halogen derivatives of alkenes are known as

a)

alkyl halides

b)

alkenyl halides

c)

alkynyl halides

d)

aryl halides

25.

An alkyl halide can be converted into an alcohol by

a)

substitution

b)

addition

c)

elimination

d)

dehydrohalogenation

26.

The alkaline hydrolysis of esters is known as

a)

hydration

b)

esterification

c)

dehydration

d)

saponification

27.

Alcohols are soluble in water due to the formation of

a)

covalent bonds

b)

ionic bonds

c)

hydrogen bonds with water

d)

none of these

28.

The quality of diesel oil for use in diesel engines is determined by

a)

the composition of the oil

b)

the octane number

c)

the cetane number

d)

the amount of additives added

29.

During the fractionation of petroleum, the fraction with the composition C12-C18 and a boiling range of 300-400 degrees C is known as

a)

kerosene oil

b)

diesel oil

c)

lubricating oil

d)

paraffin wax

30.

For improving the quality of gasoline, the presence of aromatic hydrocarbons, which have a high octane number, is necessary. This is achieved by

a)

isomerization

b)

alkylation

c)

reforming

d)

distillation under vacuum

31.

The thermal decomposition of higher hydrocarbons into lower hydrocarbons is known as

a)

reforming

b)

isomerization

c)

cracking

d)

aromatization

32.

Commercial gasoline contains mostly

a)

straight-chain alkanes

b)

cycloalkanes

c)

branched-chain alkanes

d)

aromatic hydrocarbons

33.

Liquid hydrocarbons can be converted into a mixture of gaseous hydrocarbons by

a)

hydrolysis

b)

oxidation

c)

cracking

d)

distillation under reduced pressure

34.

Petroleum consists mainly of

a)

aromatic hydrocarbons

b)

aliphatic hydrocarbons

c)

aliphatic alcohols

d)

none of these

35.

The first product obtained during the fractional distillation of petroleum is

a)

petroleum ether

b)

diesel

c)

kerosene

d)

none of these

36.

Paraffin wax is

a)

an ester

b)

an alcohol

c)

a saturated hydrocarbon

d)

an unsaturated hydrocarbon

37.

Which of the following products are obtained by the refining of petroleum?

a)

Toluene

b)

Gasoline

c)

Asphalt

d)

Carbon tetrachloride

38.

Natural silk is

a)

polyester

b)

polyamide

c)

epoxide

d)

polyurethane

39.

A mixture of acetone and carbon tetrachloride can be separated by

a)

fractional crystallization

b)

fractional distillation

c)

steam distillation

d)

vacuum distillation

40.

Credit for the first synthesis of an organic compound from an inorganic precursor is usually given to:

a)

Berzelius

b)

Arrhenius

c)

Kekule

d)

Wohler

41.

Which of the following types of hydrocarbons is(are) saturated?

a)

alkanes

b)

Alkenes

c)

Alkynes

d)

aromatics

42.

What is the major constituent of natural gas?

a)

octane

b)

Butane

c)

Propane

d)

methane

43.

Which of the following elements is the primary component of organic compounds?

a)

Oxygen

b)

Hydrogen

c)

Carbon

d)

Nitrogen

44.

What type of bonding is most prevalent in organic compounds?

a)

Ionic bonding

b)

Metallic bonding

c)

Covalent bonding

d)

Hydrogen bonding

45.

Hydrocarbons are organic compounds composed solely of which two elements?

a)

Carbon and Oxygen

b)

Carbon and Nitrogen

c)

Carbon and Hydrogen

d)

Carbon and Sulfur

46.

Which of the following functional groups characterizes an alcohol?

a)

-COOH

b)

-OH

c)

-CHO

d)

-CO-

47.

The term "isomerism" refers to compounds having the same molecular formula but different

a)

Molar mass

b)

Empirical formula

c)

Structural formula

d)

Physical state

48.

Which of the following properties is generally true for organic compounds?

a)

High melting points

b)

Good conductors of electricity

c)

Soluble in water

d)

Flammable

49.

What type of reaction involves the breaking of a double or triple bond and the addition of atoms across it?

a)

Substitution reaction

b)

Elimination reaction

c)

Addition reaction

d)

Condensation reaction

50.

What is the product when an alkene undergoes hydrogenation?

a)

Alkane

b)

Alkyne

c)

Alcohol

d)

Aldehyde

51.

What type of reaction is the conversion of an alcohol to an alkene by removing a molecule of water?

a)

Oxidation

b)

Reduction

c)

Elimination

d)

Substitution

52.

What is the primary characteristic of an aromatic compound?

a)

Contains only single bonds.

b)

Contains a benzene ring or a similar cyclic, conjugated system.

c)

Contains a carbon- carbon triple bond.

d)

Is derived from petroleum.

53.

What is the product of the complete combustion of a hydrocarbon?

a)

Carbon monoxide and water

b)

Carbon dioxide and water

c)

Carbon and water

d)

Methane and oxygen

54.

Which of the following functional groups contains a nitrogen atom?

a)

Alcohol

b)

Aldehyde

c)

Amine

d)

Ketone

55.

What is the process of joining small monomer units to form a large polymer chain called?

a)

Cracking

b)

Distillation

c)

Polymerization

d)

Fermentation

56.

Which type of isomerism involves different arrangements of atoms in space, but the same connectivity?

a)

Structural isomerism

b)

Geometric (cis- trans) isomerism

c)

Functional group isomerism

d)

Chain isomerism

57.

What type of reaction typically occurs between a carboxylic acid and an alcohol to form an ester?

a)

Hydrolysis

b)

Saponification

c)

Esterification (condensation)

d)

Reduction

58.

What is the term for compounds that have a hydroxyl group directly attached to an aromatic ring?

a)

Alcohols

b)

Ethers

c)

Phenols

d)

Carboxylic acids

59.

What is the main characteristic that distinguishes organic chemistry from inorganic chemistry?

a)

Organic chemistry deals with compounds containing metals.

b)

Organic chemistry deals primarily with carbon- containing compounds.

c)

Organic chemistry deals with compounds found in living organisms only.

d)

Organic chemistry deals with ionic compounds.

60.

What type of intermolecular forces are dominant in simple alkanes?

a)

Hydrogen bonding

b)

Dipole-dipole forces

c)

London dispersion forces (van der Waals forces)

d)

Ionic bonds

61.

Which of the following factors primarily affects the rate of an organic reaction?

a)

Color of the reactants

b)

Concentration, temperature, and presence of a catalyst

c)

Physical state of the products

d)

Melting point of the solvent

62.

What is the primary use of fractional distillation in organic chemistry?

a)

To synthesize new compounds.

b)

To separate components of a mixture based on boiling points.

c)

To determine the molecular formula of a compound.

d)

To purify solids by crystallization.

63.

Which of the following functional groups is most acidic?

a)

Alcohol

b)

Amine

c)

Carboxylic acid

d)

Aldehyde

64.

The dehydration of an alcohol results in the formation of:

a)

An aldehyde

b)

A ketone

c)

An alkene

d)

An alkane

65.

The hydrolysis of an ester in the presence of a base is known as:

a)

Fermentation

b)

Saponification

c)

Polymerization

d)

Dehydration

66.

Which of the following is typically a liquid at room temperature?

a)

Butane (C 4 H 10 )

b)

Hexane (C 6 H 14 )

c)

Methane (CH 4 )

d)

Propane (C 3 H 8 )

67.

Which of the following organic compounds is known for its sweet, fruity smell?

a)

Ester

b)

Carboxylic acid

c)

Alcohol

d)

Ketone

68.

Which type of organic compound is commonly used as a solvent in nail polish remover?

a)

Aldehyde

b)

Ketone

c)

Ether

d)

Amine

69.

What is the process of adding water across a double bond of an alkene?

a)

Dehydration

b)

Hydration

c)

Hydrolysis

d)

Hydrogenation

70.

Which of the following conditions is typically required for the halogenation of alkanes?

a)

A base catalyst

b)

UV light or high temperature

c)

High temperature and pressure only

d)

A strong acid catalyst