All Free Chemistry MCQs with Answers

• 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.

• A. Potassium formate
• B. Potassium succinate
• C. Potassium acetate
• D. Potassium fumarate

Explanation: Option B is correct since Kolbe's electrolysis of potassium succinate gives CO2 and C2H4.

• A. HBr.
• B. HCL.
• C. Br2..
• D. None of these.

Explanation: When ethene reacts with bromine, the pi bond between the two carbon atoms is broken and the bromine molecule is added across the double…

• A. Br2/H2O.
• B. Dilute alkaline KMnO4.
• C. ZnCl2/HCl.
• D. Br2/CCl4.

Explanation: Baeyer's reagent is a solution of potassium permanganate (KMnO4) in sodium hydroxide (NaOH) used to test for the presence of unsaturation…

• A. HCl
• B. H2SO4/H2O
• C. HBr
• D. All of these options are correct

Explanation: Option C is correct since Markovnikov's rule states that with the addition of a protic acid HX to an asymmetric alkene, the acid hydrogen…

• A. Polyvinyl polymer
• B. Polyvinyl Acetylene
• C. Neoprene
• D. Chloroprene

Explanation: When vinyl acetylene (also known as 1-butyne) reacts with HCl (hydrochloric acid), it undergoes a chemical reaction known as an addition…

• A. Dilute KMnO4
• B. Acidified K2Cr2O7
• C. Acidified CuCl2
• D. Pyridine

Explanation: Alkenes are readily oxidised by cold, dilute, aqueous solution of potassium permanganate (Baeyer's reagent) to give vicinal glycols.

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

Explanation: The functional group of alkenes is the presence of a double bond between two carbon atoms.

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

Explanation: The types of products obtained for ozonolysis can be used to determine the position of the double bond in compounds.