What is the maximum number of stereoisomers for a compound with three different chiral carbon atoms?
Correct answer A. 8
Subject / 763 questions
MDCAT ECAT Chemistry MCQs
Page 4 of MDCAT ECAT Chemistry multiple-choice questions with answers. Tap an option to check yourself.
Page 4 of 39
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- 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
What is the percentage by mass of carbon in methane, CH₄ (C = 12, H = 1)?
Correct answer C. 75%
In the free radical chlorination of methane, the initiation step involves ____.
Correct answer A. homolytic fission of Cl₂ by UV light
Advertisement
Which of these is a termination step in the chlorination of methane?
Correct answer C. CH₃• + Cl• → CH₃Cl
How many structurally different monochloro products can be formed by free radical chlorination of 2-methylbutane?
Correct answer D. 4
Heating bromoethane with alcoholic KOH to form ethene is an example of ____.
Correct answer B. dehydrohalogenation
Benzene prefers substitution rather than addition reactions because ____.
Correct answer C. substitution keeps the delocalised aromatic π system intact
What electrophile attacks the benzene ring during nitration with a mixture of concentrated HNO₃ and H₂SO₄?
Correct answer D. NO₂⁺
Which catalyst is used in the Friedel-Crafts alkylation of benzene with chloromethane?
Correct answer B. Anhydrous AlCl₃
Advertisement
Which substituent on a benzene ring directs an incoming electrophile to the meta position?
Correct answer C. −NO₂
Which compound gives a white precipitate with ammoniacal silver nitrate?
Correct answer D. Propyne
Hydration of ethyne using dilute H₂SO₄ and HgSO₄ gives ____.
Correct answer D. ethanal
What mass of calcium carbide is needed to produce 0.5 mol of ethyne by reaction with water (Ca = 40, C = 12)?
Correct answer C. 32 g
(CH₃)₂CHCl is classified as which type of alkyl halide?
Correct answer B. Secondary
In the carbon-halogen bond of an alkyl halide, the carbon atom carries ____.
Correct answer C. a partial positive charge
Advertisement
For the same alkyl group, which alkyl halide reacts fastest in nucleophilic substitution?
Correct answer B. Alkyl iodide
An SN2 reaction at a chiral carbon results in ____.
Correct answer C. inversion of configuration
Which alkyl halide undergoes SN1 reactions most readily?
Correct answer D. (CH₃)₃CBr
In an SN2 reaction, rate = k. If both concentrations are doubled, the rate becomes ____.
Correct answer B. four times
In the SN1 hydrolysis of 2-bromo-2-methylpropane, is tripled and is doubled. By what factor does the rate change?
Correct answer A. 3