Chemistry (School & UG)

Q. What is the stereochemical outcome of the electrophilic substitution of a chiral aromatic compound?
  • A. Retention of configuration
  • B. Inversion of configuration
  • C. Racemization
  • D. No stereochemical outcome
Q. What is the stereochemical outcome of the electrophilic substitution of a chiral benzene derivative?
  • A. Racemic mixture
  • B. Enantiomerically pure product
  • C. Diastereomers
  • D. No stereochemical change
Q. What is the stereochemical outcome of the electrophilic substitution of toluene with chlorine?
  • A. Racemic mixture
  • B. Stereospecific
  • C. No stereochemistry
  • D. Enantiomers
Q. What is the stereochemical outcome of the reaction of (R)-2-bromobutane with NaOH in a polar aprotic solvent?
  • A. Retention of configuration
  • B. Inversion of configuration
  • C. Racemization
  • D. No reaction
Q. What is the stereochemical outcome of the SN2 reaction of (R)-2-bromobutane with sodium iodide?
  • A. (R)-2-iodobutane
  • B. (S)-2-iodobutane
  • C. (R)-2-bromobutane
  • D. (S)-2-bromobutane
Q. What is the stereochemical outcome of the S_N2 reaction?
  • A. Retention of configuration
  • B. Inversion of configuration
  • C. Racemization
  • D. No stereochemical change
Q. What is the stereochemistry of 2-butanol?
  • A. R
  • B. S
  • C. R and S
  • D. Neither
Q. What is the stereochemistry of 2-butanone?
  • A. Achiral
  • B. Chiral
  • C. R/S configuration
  • D. E/Z configuration
Q. What is the stereochemistry of 2-butene?
  • A. Cis
  • B. Trans
  • C. Both cis and trans
  • D. Neither
Q. What is the stereochemistry of the product formed from the electrophilic substitution of 1,2-dimethylbenzene (o-xylene)?
  • A. R
  • B. S
  • C. R and S
  • D. None
Q. What is the stereochemistry of the product formed from the reaction of (R)-2-bromobutane with sodium iodide in acetone?
  • A. R
  • B. S
  • C. R and S
  • D. No stereochemistry change
Q. What is the stereochemistry of the product formed when 1,2-dibromobenzene undergoes electrophilic substitution?
  • A. R
  • B. S
  • C. R/S mixture
  • D. No stereochemistry
Q. What is the stereochemistry of the product formed when 1,2-dimethylbenzene undergoes electrophilic substitution?
  • A. Only one stereoisomer
  • B. Two stereoisomers
  • C. Three stereoisomers
  • D. No stereoisomers
Q. What is the term for the minimum energy required for a reaction to occur?
  • A. Enthalpy
  • B. Entropy
  • C. Activation energy
  • D. Gibbs free energy
Q. What is the term for the phenomenon where the adsorption of one species affects the adsorption of another?
  • A. Competitive adsorption
  • B. Cooperative adsorption
  • C. Desorption
  • D. Sorption
Q. What is the trend in atomic size as you move down a group in the periodic table?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It fluctuates
Q. What is the trend in electronegativity across a period in the periodic table?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Fluctuates
Q. What is the trend in electronegativity as you move down a group in the periodic table?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Fluctuates
Q. What is the trend in first ionization energy as you move down a group in the periodic table?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It fluctuates
Q. What is the trend in ionization energy across a period?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Increases then decreases
Q. What is the trend in ionization energy as you move across a period from left to right?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Varies unpredictably
Q. What is the trend in metallic character as you move across a period from left to right?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It first increases then decreases
Q. What is the typical pH range for phenolphthalein as an indicator?
  • A. 0-4
  • B. 4-10
  • C. 8-10
  • D. 10-14
Q. What is the typical range of wavelengths for infrared (IR) spectroscopy?
  • A. 400-700 nm
  • B. 700-1400 nm
  • C. 1400-4000 nm
  • D. 4000-10000 nm
Q. What is the typical range of wavelengths for UV-Vis spectroscopy?
  • A. 100-400 nm
  • B. 400-800 nm
  • C. 200-800 nm
  • D. 800-2500 nm
Q. What is the typical range of wavelengths measured in UV-Vis spectroscopy?
  • A. 200-400 nm
  • B. 400-800 nm
  • C. 200-800 nm
  • D. 800-1200 nm
Q. What is the unit of Faraday's constant?
  • A. C/mol
  • B. J/mol
  • C. V
  • D. A
Q. What is the unit of the rate constant k for a first-order reaction?
  • A. mol/L·s
  • B. s^-1
  • C. mol/L
  • D. L^2/(mol·s)
Q. What is the unit of the rate constant k for a second-order reaction?
  • A. M
  • B. M/s
  • C. 1/M·s
  • D. M^2/s
Q. What is the value of the azimuthal quantum number (l) for a 3d orbital?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
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