Free Chemistry of Hydrocarbons MCQs with Answers

• A. Reforming
• B. Distillation
• C. Cracking
• D. Decomposition

Explanation: "Cracking" is a process in which long-chain hydrocarbons are broken into small chain hydrocarbons by means of heat and pressure.

• A. Silica, Lime
• B. Silica, Alumina
• C. Silica, Soda ash
• D. Alumina, pt

Explanation: In the process of catalytic cracking, solid catalysts convert plastics into liquid fuel [lighter fractions].

• A. 40
• B. 100
• C. Zero
• D. 2

Explanation: Octane number means the ability of any fuel to resist knocking when it is ignited in a mixture of air.

• A. 96 litres
• B. 9.6 litres
• C. 44.8 litres
• D. 67.2 litres

Explanation: 4gm of Ethylene (C2H4) = 0.1428 moles or 3.2L of it. The Balanced Chemical Equation for this reaction is: C2H4+ 3O2 -> 2CO2 + 2H2O+ energy…

• A. Alkanes
• B. Alkenes
• C. Alkynes
• D. Benzene

Explanation: Alkanes are least reactive, followed by benzene. Alkenes are more reactive than alkynes.

• A. sp2
• B. sp3
• C. sp2d
• D. sp

Explanation: Remember that alkanes have sp3 hybridization, alkenes have sp2 hybridization and alkynes have sp hybridization.

• A. Ethane
• B. Ethyne
• C. Ethylbenzene
• D. Ethene

Explanation: Alkanes cannot be oxidized; rather they can be oxidized only when burned in the presence of O2 to give carbon dioxide and water.

• A. Alkanes
• B. Alkenes
• C. Alkynes
• D. All of the above options are correct

Explanation: Geometric Isomerism results most commonly from C=C. The important property which introduces the feature is the inability of the Carbon…

• A. Alcohol
• B. Ethers
• C. Alkynes
• D. Alkenes

Explanation: Geometric Isomerism is commonly observed in Carbon-Carbon double bonds. Carbon-carbon double bonded compounds have restricted rotation.

• A. 1-chloropropane
• B. 2-chloropropane
• C. 3-chloropropane
• D. None pf the above

Explanation: HCl reacts with propene in an electrophilic addition reaction. According to Markovnikov's rule, the H (of HCl) bonds to the carbon which…

• A. Decomposition
• B. Dehydration
• C. Dehydroxylation
• D. Dehalogenation

Explanation: Ethene is prepared from alcohol by dehydration. Dehydration is the removal of water from a compound.

• A. Hydrohalogenation of alkenes
• B. Dehydration of alkenes
• C. Hydration of alkenes
• D. Hydroxylation of alkenes

Explanation: he method that is used on an industrial scale for the production of alcohol from alkene is hydration of alkenes.

• A. Nickel
• B. Gold
• C. Palladium
• D. Raney Nickel

Explanation: OPTION A: Hydrogenation of alkenes does not occur in the presence of simple nickel because it does not have the necessary activity and…

• A. Ethylene glycol
• B. Ethylene epoxide
• C. Methylene oxide
• D. Both Options A and B are correct

Explanation: Alkenes are capable of reacting with oxygen in the presence of elemental silver to form a series of cyclic ethers called epoxides.

• A. Trans-isomers
• B. Alkanes
• C. Cis-isomers
• D. Positional isomers

Explanation: Only in cis-trans isomers, there is a double bond between the carbon atoms having bulky groups on either side.

• A. -ene
• B. -ylene
• C. -yne
• D. -eylene

Explanation: OPTION A: In the IUPAC system of alkenes, the suffix -ane of the corresponding alkane is replaced by the suffix -ene.

• A. Dehydration
• B. Ozonolysis
• C. Markovnikov's addition
• D. Oxidation with KMnO4

Explanation: OPTION A: Dehydration reactions can be defined as chemical reactions in which a water molecule is eliminated from the reactant molecule.

• A. Dehydration
• B. Hydroxylation
• C. Hydration
• D. Luca's test

Explanation: When ethene is subjected to 'hydroxylation' in the presence of cold and dilute alkaline potassium permanganate solution, the addition of…

• A. -ene
• B. -ane
• C. -yne
• D. -ylene

Explanation: -ene is IUPAC suffix -ane is for alkanes -yne is for alkynes

• A. Direct addition
• B. Markovnikov's addition
• C. Anti Markovnikov's addition
• D. Dehydration

Explanation: Since the alkene and the reagent (HBr) are both unsymmetrical markovnikov's rule will be followed.