Carbon and Its Compounds MCQ Class 10 with Answers 2025

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Carbon and Its Compounds mcq Class 10 with Answers for Students

The IUPAC name of CH₃(CH₂)₉CH₃ is

A) Triacontane

B) Decane

C) Icosane

D) Dodecane

Option a – Triacontane

Cyclohexane belongs to which class of compounds

A) Non-benzenoid aromatic compound

B) Heterocyclic compound

C) Benzenoid aromatic compound

D) Alicyclic compound

Option d – Alicyclic compound

The structural formula CH₃OH represents which type of formula

A) Complete structural formula

B) Condensed structural formula

C) Bond-line structural representation

D) Wedge-and-dash representation

Option b – Condensed structural formula

The ability of carbon to form C–C covalent bonds is called

A) Allotropy

B) Covalency

C) Tetravalency

D) Catenation

Option d – Catenation

Number of covalent bonds in butane and hexane respectively

A) 13 and 19

B) 11 and 19

C) 14 and 20

D) 10 and 16

Option a – 13 and 19

The compound giving a cooling effect in mint leaves is

A) Menthol

B) Ethanol

C) Caffeine

D) Capsaicin

Option a – Menthol

A four-carbon chain with a triple bond is called

A) Butene

B) Butanal

C) Butyne

D) Butanol

Option a – Butene

Denatured Alcohol refers to

A) Pure ethanol

B) Ethanol mixed with a small amount of methanol

C) Pure methanol

D) Propanol

Option b – Ethanol mixed with a small amount of methanol

A Molecule with the formula C₂H₄ is

A) Propane

B) Butane

C) Ethane

D) Ethene

Option c – Ethane

The straight-chain alkyl carboxylic Acid CH₃CH₂CH₂COOH is

A) Butyric Acid

B) Methanoic Acid

C) Ethanoic Acid

D) Propionic Acid

Option a – Butyric Acid

The straight-chain alkane with formula C₁₂H₂₆ used in biodegradable detergents is

A) Dodecane

B) Nonane

C) Icosane

D) Nonadecane

Option b – Nonane

The IUPAC name of tertiary-butyl Alcohol is

A) 2-Methylpropan-2-ol

B) 1-Methylpropan-3-ol

C) 1-Propylpropan-3-ol

D) 1-Ethylpropan-3-ol

Option a – 2-Methylpropan-2-ol

Which carbon allotrope was discovered by Curl, Kroto, and Smalley in 1985

A) Graphene

B) Carbophene

C) Fullerene

D) Lonsdaleite

Option c – Fullerene

Which of the following is a saturated hydrocarbon

A) CH₄

B) C3H8

C) C₆H₆

D) C₂H₄

Option b – C3H8

A Grignard reagent is represented as

A) CH₃–Be–F

B) CH₃–Ca–F

C) CH₃–Mg–Cl

D) H–Mg–H

Option c – CH₃–Mg–Cl

Haloalkanes or aryl/vinyl halides reacting with magnesium yield

A) Grignard reagent

B) Hinsberg reagent

C) Fehling reagent

D) Tollens’ reagent

Option a – Grignard reagent

Which 20-carbon unsaturated hydrocarbon is used in candles and for Solar-energy storage

A) Octane

B) Eicosane

C) Nonane

D) Triacontane

Option c – Nonane

The synthetic antioxidant used in foods like crackers and popcorn is

A) Tertiary butyl hydroquinone

B) Diethyltoluamide

C) Sodium hypochlorite

D) 1,4-Dichlorobenzene

Option a – Tertiary butyl hydroquinone

Tribromomethane is another name for

A) Bromoform

B) Diborane

C) Borazine

D) Bromosuccinimide

Option a – Bromoform

Methyl ethyl ketone is also called

A) Methyl pentanone

B) 2-Butanol

C) 2-Butanone

D) Propanone

Option c – 2-Butanone

Which of these is an open-chain Organic Molecule?

A) Toluene

B) Tetrahydrofuran

C) Benzene

D) Acetaldehyde

Option d – Acetaldehyde

Which option is NOT a characteristic of graphite?

A) Conducts Electricity

B) Has a low melting point

C) Possesses lower density than diamond

D) Conducts Heat

Option b – Has a low melting point

Choose the correct Molecular formula of butane.

A) CH₄

B) C₄H₁₀

C) C₂H₄

D) C₄H₆

Option b – C₄H₁₀

Identify the correct formula for the aldehyde functional group.

A) –CH₂O

B) –COOH

C) –CHO

D) –OH

Option c – –CHO

Which compound is a primary arylamine with an –NH₂ group replacing one hydrogen on a benzene ring?

A) Pyridine

B) Aniline

C) Quinoline

D) Toluidine

Option b – Aniline

What is the IUPAC name of the colorless gas called acetylene, used in welding?

A) Ethyne

B) Ethanoic anhydride

C) Ethyl acetate

D) Azoethane

Option a – Ethyne

Which compound reacts with nitrous Acid at 273–278 K to yield benzenediazonium chloride?

A) Hydrazine

B) Toluene

C) Aniline

D) Pyridine

Option c – Aniline

When ethanol is heated with excess concentrated sulphuric Acid, it forms:

A) Ethane

B) Ethyne

C) Ethene

D) Butane

Option c – Ethene

In alkenes, carbon atoms are connected by which type of bond?

A) Single bond

B) Double bond

C) Triple bond

D) No bond

Option b – Double bond

Organic compounds with an oxygen Atom linking two alkyl groups are classified as:

A) Alcohols

B) Aldehydes

C) Ethers

D) Ketones

Option c – Ethers

The strength of a hydrogen bond depends on:

A) Interaction between lone-pair electrons of an electronegative Atom in one Molecule and a hydrogen Atom in another.

B) Interaction between lone-pair electrons of an electropositive Atom in one Molecule and a hydrogen Atom in another.

C) Interaction between lone-pair electrons of an electronegative Atom in one Molecule and an oxygen Atom in another.

D) Interaction between lone-pair electrons of a polar Molecule and a hydrogen Atom in another.

Option a – Interaction between lone-pair electrons of an electronegative Atom in one Molecule and a hydrogen Atom in another.

Which statement about Hydrocarbons is incorrect?

A) Saturated Hydrocarbons are largely unreactive and inert to most reagents.

B) Carbon compounds release significant Heat and Light during combustion.

C) Carbon compounds cannot be oxidised when burned.

D) Unsaturated Hydrocarbons can absorb hydrogen in the presence of palladium or nickel catalysts to form saturated Hydrocarbons.

Option c – Carbon compounds cannot be oxidised when burned.

How are the carbon atoms bonded in an ethyne Molecule?

A) Carbon–carbon single bond

B) Carbon–carbon double bond

C) Carbon–carbon triple bond

D) Carbon–hydrogen double bond

Option c – Carbon–carbon triple bond

Which carbon allotrope(s) conduct Electricity?

A) Diamond only

B) Diamond and graphite

C) Graphite only

D) Diamond and fullerene

Option c – Graphite only

A yellow flame with thick black smoke while burning a hydrocarbon fuel indicates the fuel is:

A) Made of saturated Hydrocarbons

B) Made of unsaturated Hydrocarbons

C) Burning completely

D) Moist

Option b – Made of unsaturated Hydrocarbons

Determine the number of saturated and unsaturated bonds present in cyclohexane.

A) 9 and 0

B) 18 and 3

C) 9 and 3

D) 18 and 0

Option d – 18 and 0

Which description accurately compares diamond and graphite?

A) Both does not have similar physical and chemical traits.

B) They differ physically but are chemically similar.

C) They are physically similar but chemically different.

D) They possess distinct physical and chemical properties.

Option a – Both does not have similar physical and chemical traits.

Which substance emits a pleasant, fruity aroma?

A) Ethyl Alcohol

B) Acetic Acid

C) Ethyl acetate

D) Acetophenone

Option c – Ethyl acetate

When soap dissolves in water, it produces:

A) Metallotropic liquid crystal

B) Thermotropic liquid crystal

C) Homogeneous solution

D) Lyotropic liquid crystal

Option d – Lyotropic liquid crystal

What is the elemental makeup of diamond?

A) Carbon and Hydrogen

B) Carbon and Oxygen

C) Pure Carbon

D) Pure Silicon

Option c – Pure Carbon

Which option below is not classified as an Organic compound?

A) Marsh gas

B) Ammonium cyanate

C) Urea

D) Cane sugar

Option b – Ammonium cyanate

Choose the statement that is incorrect about soaps and detergents.

A) Soap consists of sodium or potassium Salts of long-chain fatty Acids.

B) Soap molecules have both hydrophobic and hydrophilic ends.

C) Detergents work more effectively than soap in hard water.

D) In micelles, the ionic portion of the Molecule points toward the oil droplet while the other end faces outward.

Option d – In micelles, the ionic portion of the Molecule points toward the oil droplet while the other end faces outward.

Which class of natural compounds, found in fruits, vegetables, and grains, consists of substances with diverse phenolic structures?

A) Hopanoids

B) Pectins

C) Resins

D) Flavonoids

Option d – Flavonoids

Which of the following does not belong to the category of Organic compounds?

A) Furan

B) Decane

C) Ammonia

D) Nonane

Option c – Ammonia

Identify the compound that contains a saturated four-carbon fatty Acid, commonly present in esterified form in Animal fats and vegetable oils:

A) Propionic acid

B) Butyric acid

C) Succinic acid

D) Lactic acid

Option b – Butyric acid

What is the name of the reaction in which fats or oils react with a strong alkali, such as sodium hydroxide, to produce soap?

A) Saponification

B) Combustion

C) Fermentation

D) Oxidation

Option a – Saponification

The chemical N₂O is commonly known as:

A) Nitric oxide

B) Nitrogen dioxide

C) Nitrous oxide

D) Dinitrogen pentoxide

Option d – Dinitrogen pentoxide

Identify the hydrocarbon represented by the structural formula CH₃–CH₂–CH₂–CH₂–CH₂–CH₃:

A) 2,2-Dimethylbutane

B) 2-Methylpentane

C) 3-Methylhexane

D) n-Hexane

Option d – n-Hexane

Which of these polyhalogen compounds is used to manufacture the freon refrigerant R-22?

A) Carbon Tetrachloride

B) Dichlorodiphenyltrichloroethane

C) Chloroform

D) Methylene Chloride

Option c – Chloroform

Which of the following is classified as a benzenoid compound?

A) Acetaldehyde

B) Aniline

C) Propane

D) Hexane

Option b – Aniline

Which of the following is not a form of carbon allotrope?

A) Phosphorus

B) Buckminsterfullerene

C) Diamond

D) Graphite

Option a – Phosphorus

What is the correct IUPAC name for m-Dichlorobenzene?

A) 1,2-Dichlorobenzene

B) 3,4-Dichlorobenzene

C) 2,3-Dichlorobenzene

D) 1,3-Dichlorobenzene

Option d – 1,3-Dichlorobenzene

In IUPAC nomenclature, the part of the name that denotes the total number of carbon atoms in the longest continuous chain is called the:

A) Prefix

B) Suffix

C) Infix

D) Root

Option a – Prefix

Arrange the following compounds in the order of decreasing octane numbers: butane, pentane, hexane, and cyclohexane.

A) Butane > Pentane > Hexane > Cyclohexane

B) Butane > Pentane > Cyclohexane > Hexane

C) Butane > Cyclohexane > Pentane > Hexane

D) Cyclohexane > Butane > Pentane > Hexane

Option c – Butane > Cyclohexane > Pentane > Hexane

Why is methanol considered toxic? ( Carbon and Its Compounds mcq Class 10 with Answers )

A) It directly causes coagulation of protoplasm

B) It is converted to formaldehyde in the liver, which then coagulates the protoplasm

C) It oxidizes to acetic acid in the liver, leading to protoplasm coagulation

D) It is transformed to carbon monoxide in the liver, causing coagulation of the protoplasm

Option b – It is converted to formaldehyde in the liver, which then coagulates the protoplasm

Vinegar is essentially: ( Carbon and Its Compounds mcq Class 10 with Answers )

A) A 5–8% aqueous solution of acetic acid

B) A 5–8% aqueous solution of carbonic acid

C) A 5–8% aqueous solution of ethanol

D) A 10–15% aqueous solution of propionic acid

Option a – A 5–8% aqueous solution of acetic acid

Which catalyst system is typically used to convert unsaturated Hydrocarbons into saturated Hydrocarbons? ( Carbon and Its Compounds mcq Class 10 with Answers )

A) Iron and hydrogen

B) Copper and hydrogen

C) Zinc and hydrogen

D) Nickel and hydrogen

Option d – Nickel and hydrogen

Which element exhibits the strongest tendency to form long chains of atoms (catenation)? ( Carbon and Its Compounds mcq Class 10 with Answers )

A) Silicon

B) Carbon

C) Nitrogen

D) Oxygen

Option b – Carbon

Identify the incorrect statement about the cleansing action of soap: ( Carbon and Its Compounds mcq Class 10 with Answers )

A) Oils and dirt are trapped at the center of the micelle

B) Soap micelles scatter Light

C) Soaps are ammonium Salts of long-chain fatty Acids

D) Soap reacts with calcium and magnesium ions in hard water to form insoluble precipitates

Option c – Soaps are ammonium Salts of long-chain fatty Acids

Hydrogenation of vegetable oils with a nickel catalyst represents which type of reaction? ( Carbon and Its Compounds mcq Class 10 with Answers )

A) Substitution reaction

B) Elimination reaction

C) Addition reaction

D) Free-radical polymerization

Option c – Addition reaction

How many covalent bonds are present in a molecule of methanol? ( Carbon and Its Compounds mcq Class 10 with Answers )

A) 3

B) 4

C) 5

D) 6

Option c – 5

Which carbon allotrope shares the same crystal structure as crystalline silicon? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Coke

B) Diamond

C) Graphite

D) Coal

Option b – Diamond

Identify the covalent compound from the following list: ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Calcium oxide

B) Sodium nitride

C) Silicon carbide

D) Zinc sulphide

Option c – Silicon carbide

Which of these statements is inaccurate? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Most carbon compounds are good conductors of Electricity

B) Organic compounds exhibit covalent Bonding

C) Graphite can act as a lubricant

D) Diamond is a carbon allotrope

Option a – Most carbon compounds are good conductors of Electricity

How many structural isomers does pentane have? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) 5

B) 4

C) 2

D) 3

Option d – 3

C₂H₂ belongs to which homologous series? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Alkanes

B) Alkenes

C) Alkynes

D) Cycloalkanes

Option b – Alkenes

Which of the following sets of Hydrocarbons is arranged in order of increasing boiling points? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Methane, Butane, Propane, Heptane

B) Propane, Butane, Pentane, Octane

C) Propane, Butane, Heptane, Methane

D) Octane, Ethane, Methane, Propane

Option b – Propane, Butane, Pentane, Octane

Which statement about carbon allotropes is false? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) Graphite conducts Electricity efficiently

B) Diamond is the hardest known material

C) Fullerene is one of carbon’s allotropes

D) Graphite is the second hardest substance after diamond

Option d – Graphite is the second hardest substance after diamond

What is the purpose of potassium hydroxide in soap-making (saponification)? ( Carbon and Its Compounds MCQ Class 10 with Answers )

A) To produce hard soaps

B) To make soft soaps

C) To add fragrance naturally

D) To make the saponification process more cost-effective

Option b – To make soft soaps

Buckminsterfullerene, a molecule shaped like a soccer ball, is an allotrope of: ( Carbon and Its Compounds MCQ Class 10 with Answers )