All Free Chemistry MCQs with Answers

• A. Substitution reaction
• B. Elimination reaction
• C. Addition reaction
• D. Oxidation reaction

Explanation: Benzene cannot undergo elimination reactions.

• A. They are electron-donating groups
• B. They increase reactivity of mono- substituted benzene ring
• C. They have all lone pair at the central atom of molecules expect alkyl group
• D. Halogeno-substituted benzene is more reactive than benzene

Explanation: Explanation for this question will be added soon.

• A. Vinyl acetylene
• B. Di-vinyl acetylene
• C. Neoprene
• D. Ethylene

Explanation: When acetylene (ethyne) is passed under pressure over an organo-nickel catalyst at 70°C, the product formed is ethylene (ethylene gas).The…

• A. Option A
• B. Optiion B
• C. Option C
• D. Option D

Explanation: The above molecular formula represents 4-Ethyl 1-3.4-dimethylheptane.

• A. Reaction with hydrogen (hydrogenation)
• B. Reaction with HX (hydrohalogenation)
• C. Reaction with H20 (hyaation)
• D. All of these

Explanation: Ethene, also known as ethylene, is an alkene with a double bond between two carbon atoms. It can undergo various reactions.

• A. Cyclohexzene
• B. Benzene
• C. Ethyne
• D. Pentene

Explanation: Explanation for this question will be added soon.

• A. 3-Methyl-1 -penten-4-yne
• B. 3-Methy1-4-penten-1-yne
• C. 2-Methyl-I -penten-3-yne
• D. 3-Methy1-3-penten-1-yne

Explanation: The explanation for this question will be added soon!

• A. m-Bromophenol
• B. o-and p-Bromophenol
• C. 2,4-Dibromophenol
• D. 2,4,6-Tribromoplicnol

Explanation: When phenol is treated with excess of bromine water, it gives 2,4,6-tribromophenol as the major product.

• A. Tetrahedral
• B. Hexagonal planer
• C. Hexagonal irregular
• D. Trigonal planar

Explanation: The structure of benzene is a planar ring of six carbon atoms, with one hydrogen atom attached to each carbon atom.

• A. upto 4
• B. 5 to 17
• C. 17 or more
• D. None of these

Explanation: Alkanes first five compounds are gaesous. Then next are liquids, rest are solids.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: The introduction of an alkyl group (an alkyl substitution) into benzene takes place through a Friedel-Crafts alkylation reaction.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: When propene (CH3-CH=CH2) reacts with hydrogen bromide (HBr), it undergoes an addition reaction to form 2-bromopropane.

• A. H2SO4
• B. AlCl3
• C. HNO3
• D. HCI

Explanation: Any halogen in its standard state is not a strong electrophile to attack the electron cloud on the benzene ring and react with it.

• A. Carboxylic acid
• B. Aldehyde
• C. Ketone
• D. Alcohol
• E. All

Explanation: The catalytic oxidation of alkanes can result in the formation of carboxylic acids, aldehydes, ketones, and alcohols

• A. Mustard gas
• B. Launching gas
• C. Phosgene gas
• D. Bio gas

Explanation: Beta and beta prime dichloro ethyl sulphide is commonly known as Mustard gas.

• A. Numbering starts from functional group which is double bond in this case
• B. Single bond
• C. Triple bond
• D. Hydrogen bond

Explanation: Numbering starts from functional group which is double bond in this case

• A. 120kJ/mole
• B. 130 kJ/mole
• C. 125kJ/ mole
• D. 150 kJ/mole

Explanation: Factual statement that needs to be learnt

• A. Aluminum
• B. Nickel
• C. Cupper
• D. Sodium

Explanation: Raney nickel is a form of nickel used as catalyst

• A. 200°C and 100 atm
• B. 500°C and 200 atm
• C. 400°C and 100 atm
• D. 400°C and 200 atm

Explanation: Option C provides the most suitable conditions for the polymerization of ethene to polyethylene: Temperature of 400°C: This temperature is…

• A. Ethene
• B. Ethane
• C. Propane
• D. Peopene

Explanation: Ethene is not colorless. It is a colorless gas with a slightly sweet odor.