Worksheets8th session
Total questions: 70
Worksheet time: 35mins
What general class of compounds is also known as olefins?
alkenes
alkynes
aromatics
alkanes
The simplest alkyne is .
ethylene
ethane
acetylene
propyne
The melting and boiling points of hydrocarbons are determined by
ion-dipole attraction
dipole-dipole attraction
London forces
hydrogen bonding
Hydrocarbons containing carbon- carbon triple bonds are called
alkanes
aromatic hydrocarbons
alkynes
alkenes
The molecular geometry of each carbon atom in an alkane is .
octahedral
square planar
trigonal planar
tetrahedral
The minimum number of carbons necessary for a hydrocarbon to form a branched structure is
4
6
3
9
Hydrocarbons containing only single bonds between the carbon atoms are called .
alkenes
alkynes
aromatics
alkanes
The general formula of an alkane is .
C2nH2n+2
CnH2n
CnH2n+2
CnH2n-2
Gasoline and water do not mix because gasoline is
less dense than water
less viscous than water
nonpolar and water is polar
volatile and water is not
In general,_______are the most reactive hydrocarbons
alkenes
alkynes
alkanes
cycloalkanes
The general formula for an ether is
R-O-R'
R-CO-R'
R-CO-OH
R-OH
Ethers can be made by condensation of two molecules by splitting out a molecule of water.
alkyne
alcohol
ketone
aldehyde
The general formula of a carboxylic acid is
R-O-R'
R-CO-R'
R-CO-OH
R-H
Optically active molecules that are mirror images of each other are called
allotropes
geometrical isomers
enantiomers
cofactors
When petroleum is distilled to separate the components by boiling point, the component with the highest boiling point is called
asphalt
gasoline
kerosene
paraffin
The large number of organic compounds is due to
the valency of carbon
the small size of carbon
a special property of carbon known as catenation
none of these
The halogenation of alkanes is an example of
nucleophilic substitution
electrophilic substitution
oxidation
free-radical substitution
A liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by
hydrolysis
oxidation
distillation in vacuum
cracking
The most common reactions of alkenes are those of
nucleophilic substitution
electrophilic substitution
electrophilic addition
nucleophilic addition
Which of the following is obtained by addition polymerization?
PVC
Terylene
Nylon
Polyamide
Teflon is obtained from
difluoroethene
monofluoroethene
tetrafluoroethene
tetrafluoroethane
A compound having a bond angle of 180 degrees is a/an
alkane
alkene
cycloalkane
alkyne
Addition polymerization can be brought about by the following except?
free radicals
anions
cations
metals
The halogen derivatives of alkenes are known as
alkyl halides
alkenyl halides
alkynyl halides
aryl halides
An alkyl halide can be converted into an alcohol by
substitution
addition
elimination
dehydrohalogenation
The alkaline hydrolysis of esters is known as
hydration
esterification
dehydration
saponification
Alcohols are soluble in water due to the formation of
covalent bonds
ionic bonds
hydrogen bonds with water
none of these
The quality of diesel oil for use in diesel engines is determined by
the composition of the oil
the octane number
the cetane number
the amount of additives added
During the fractionation of petroleum, the fraction with the composition C12-C18 and a boiling range of 300-400 degrees C is known as
kerosene oil
diesel oil
lubricating oil
paraffin wax
For improving the quality of gasoline, the presence of aromatic hydrocarbons, which have a high octane number, is necessary. This is achieved by
isomerization
alkylation
reforming
distillation under vacuum
The thermal decomposition of higher hydrocarbons into lower hydrocarbons is known as
reforming
isomerization
cracking
aromatization
Commercial gasoline contains mostly
straight-chain alkanes
cycloalkanes
branched-chain alkanes
aromatic hydrocarbons
Liquid hydrocarbons can be converted into a mixture of gaseous hydrocarbons by
hydrolysis
oxidation
cracking
distillation under reduced pressure
Petroleum consists mainly of
aromatic hydrocarbons
aliphatic hydrocarbons
aliphatic alcohols
none of these
The first product obtained during the fractional distillation of petroleum is
petroleum ether
diesel
kerosene
none of these
Paraffin wax is
an ester
an alcohol
a saturated hydrocarbon
an unsaturated hydrocarbon
Which of the following products are obtained by the refining of petroleum?
Toluene
Gasoline
Asphalt
Carbon tetrachloride
Natural silk is
polyester
polyamide
epoxide
polyurethane
A mixture of acetone and carbon tetrachloride can be separated by
fractional crystallization
fractional distillation
steam distillation
vacuum distillation
Credit for the first synthesis of an organic compound from an inorganic precursor is usually given to:
Berzelius
Arrhenius
Kekule
Wohler
Which of the following types of hydrocarbons is(are) saturated?
alkanes
Alkenes
Alkynes
aromatics
What is the major constituent of natural gas?
octane
Butane
Propane
methane
Which of the following elements is the primary component of organic compounds?
Oxygen
Hydrogen
Carbon
Nitrogen
What type of bonding is most prevalent in organic compounds?
Ionic bonding
Metallic bonding
Covalent bonding
Hydrogen bonding
Hydrocarbons are organic compounds composed solely of which two elements?
Carbon and Oxygen
Carbon and Nitrogen
Carbon and Hydrogen
Carbon and Sulfur
Which of the following functional groups characterizes an alcohol?
-COOH
-OH
-CHO
-CO-
The term "isomerism" refers to compounds having the same molecular formula but different
Molar mass
Empirical formula
Structural formula
Physical state
Which of the following properties is generally true for organic compounds?
High melting points
Good conductors of electricity
Soluble in water
Flammable
What type of reaction involves the breaking of a double or triple bond and the addition of atoms across it?
Substitution reaction
Elimination reaction
Addition reaction
Condensation reaction
What is the product when an alkene undergoes hydrogenation?
Alkane
Alkyne
Alcohol
Aldehyde
What type of reaction is the conversion of an alcohol to an alkene by removing a molecule of water?
Oxidation
Reduction
Elimination
Substitution
What is the primary characteristic of an aromatic compound?
Contains only single bonds.
Contains a benzene ring or a similar cyclic, conjugated system.
Contains a carbon- carbon triple bond.
Is derived from petroleum.
What is the product of the complete combustion of a hydrocarbon?
Carbon monoxide and water
Carbon dioxide and water
Carbon and water
Methane and oxygen
Which of the following functional groups contains a nitrogen atom?
Alcohol
Aldehyde
Amine
Ketone
What is the process of joining small monomer units to form a large polymer chain called?
Cracking
Distillation
Polymerization
Fermentation
Which type of isomerism involves different arrangements of atoms in space, but the same connectivity?
Structural isomerism
Geometric (cis- trans) isomerism
Functional group isomerism
Chain isomerism
What type of reaction typically occurs between a carboxylic acid and an alcohol to form an ester?
Hydrolysis
Saponification
Esterification (condensation)
Reduction
What is the term for compounds that have a hydroxyl group directly attached to an aromatic ring?
Alcohols
Ethers
Phenols
Carboxylic acids
What is the main characteristic that distinguishes organic chemistry from inorganic chemistry?
Organic chemistry deals with compounds containing metals.
Organic chemistry deals primarily with carbon- containing compounds.
Organic chemistry deals with compounds found in living organisms only.
Organic chemistry deals with ionic compounds.
What type of intermolecular forces are dominant in simple alkanes?
Hydrogen bonding
Dipole-dipole forces
London dispersion forces (van der Waals forces)
Ionic bonds
Which of the following factors primarily affects the rate of an organic reaction?
Color of the reactants
Concentration, temperature, and presence of a catalyst
Physical state of the products
Melting point of the solvent
What is the primary use of fractional distillation in organic chemistry?
To synthesize new compounds.
To separate components of a mixture based on boiling points.
To determine the molecular formula of a compound.
To purify solids by crystallization.
Which of the following functional groups is most acidic?
Alcohol
Amine
Carboxylic acid
Aldehyde
The dehydration of an alcohol results in the formation of:
An aldehyde
A ketone
An alkene
An alkane
The hydrolysis of an ester in the presence of a base is known as:
Fermentation
Saponification
Polymerization
Dehydration
Which of the following is typically a liquid at room temperature?
Butane (C 4 H 10 )
Hexane (C 6 H 14 )
Methane (CH 4 )
Propane (C 3 H 8 )
Which of the following organic compounds is known for its sweet, fruity smell?
Ester
Carboxylic acid
Alcohol
Ketone
Which type of organic compound is commonly used as a solvent in nail polish remover?
Aldehyde
Ketone
Ether
Amine
What is the process of adding water across a double bond of an alkene?
Dehydration
Hydration
Hydrolysis
Hydrogenation
Which of the following conditions is typically required for the halogenation of alkanes?
A base catalyst
UV light or high temperature
High temperature and pressure only
A strong acid catalyst
