In the sulphonation of benzene with fuming sulphuric acid, the attacking electrophile is ____.
Correct answer B. SO₃
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MDCAT ECAT Chemistry MCQs
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- Gases 40
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- Chemical Equilibrium 40
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- Thermochemistry and Energetics 40
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- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
Which substance is used as a catalyst for the bromination of benzene?
Correct answer D. FeBr₃
What is the main organic product when benzene reacts with chloromethane in the presence of anhydrous AlCl₃?
Correct answer C. Methylbenzene
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What is the major product of the nitration of nitrobenzene?
Correct answer C. 1,3-Dinitrobenzene
Which substituent on a benzene ring is deactivating but ortho/para-directing?
Correct answer D. –Cl
What is the IUPAC name of CH₃C≡CCH₃?
Correct answer A. But-2-yne
Ethyne reacts with sodium metal to release hydrogen because ____.
Correct answer D. its hydrogen atoms are weakly acidic, as the sp-hybridised carbon has 50% s character
What volume of ethyne at STP is produced when 6.4 g of calcium carbide reacts with excess water (Ca = 40, C = 12, molar volume = 22.4 dm³)?
Correct answer C. 2.24 dm³
What is the product when ethyne is passed into dilute sulphuric acid containing mercury(II) sulphate?
Correct answer B. Ethanal
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What volume of hydrogen at STP is needed to convert 2.6 g of ethyne completely into ethane (C = 12, H = 1, molar volume = 22.4 dm³)?
Correct answer C. 4.48 dm³
What is the main product when ethyne reacts with excess hydrogen bromide?
Correct answer A. 1,1-Dibromoethane
What is the IUPAC name of (CH₃)₃CBr?
Correct answer A. 2-Bromo-2-methylpropane
What is the IUPAC name of CH₃CH₂CH(Cl)CH₃?
Correct answer A. 2-Chlorobutane
2-Bromopropane, (CH₃)₂CHBr, is classified as a ____ alkyl halide.
Correct answer D. secondary
How many σ and π bonds are present in acrylonitrile, CH₂=CH–C≡N?
Correct answer B. 6 σ and 3 π
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Successive members of a homologous series differ in molar mass by ____.
Correct answer B. 14 g mol⁻¹
What is the degree of unsaturation (double bond equivalent) of benzene, C₆H₆?
Correct answer B. 4
How many isomeric dichlorobenzenes, C₆H₄Cl₂, are possible?
Correct answer B. 3
What is the IUPAC name of (CH₃)₂CHCH₂CH₃?
Correct answer B. 2-Methylbutane
In the chlorination of methane in sunlight, the initiation step is ____.
Correct answer B. homolytic fission of Cl₂ into two chlorine radicals