Chemical Reactions MCQ

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• Fittig reaction results in the formation of a diphenyl.
  ক

  True

  খ

  False
• Predict the minor product formed when chlorobenzene reacts with chloromethane in the presence of anhydrous AlCl3?
  ক

  Toluene

  খ

  m-Chlorotoluene

  গ

  o-Chlorotoluene

  ঘ

  p-Chlorotoluene
• Which is the metal involved in Wurtz-Fittig reaction?
  ক

  Iron

  খ

  Magnesium

  গ

  Aluminium

  ঘ

  Sodium
• Identify ‘X’ from the reaction shown.
  ক

  Dilute H2SO4

  খ

  Concentrated H2SO4

  গ

  Dilute HNO3

  ঘ

  Concentrated HNO3
• What is the major product formed when chlorobenzene reacts with nitric acid in concentrated sulphuric acid?
  ক

  Nitrobenzene

  খ

  1-Chloro-2-nitrobenzene

  গ

  1-Chloro-3-nitrobenzene

  ঘ

  1-Chloro-4-nitrobenzene
• Identify the catalyst in Friedel-Crafts acylation reaction.
  ক

  Anhydrous FeCl3

  খ

  Anhydrous AlCl3

  গ

  NaNO2

  ঘ

  Alcoholic KOH
• 2-Chloronitrobenzene is more reactive than chlorobenzene.
  ক

  True

  খ

  False
• Which of the following compounds is most easily converted to a phenol when heated with aqueous NaOH solution?
  ক

  Chlorobenzene

  খ

  4-Chloronitrobenzene

  গ

  2,4-Dinitrochlorobenzene

  ঘ

  2,4,6-Trinitrochlorobenzene
• The C-Cl bond length in chlorobenzene is less than the C-Cl bond length in chloromethane because of the ________
  ক

  resonance effect in haloarenes

  খ

  difference in hybridisation of carbon in C-Cl bond

  গ

  instability of phenyl cation

  ঘ

  possible repulsion between nucleophile and chlorobenzene
• Compared to haloalkanes, the reactivity of haloarenes towards nucleophilic substitution reactions is _________
  ক

  low

  খ

  high

  গ

  very high

  ঘ

  equal
• What will be the product of the following reaction? 2CH3CH2Br + 2Na + dry ether = ________
  ক

  Ethane

  খ

  1-Bromoethane

  গ

  Butane

  ঘ

  1-Bromobutane
• What is formed when ethyl magnesium bromide reacts with water?
  ক

  Grignard reagent

  খ

  Ethane

  গ

  Ethanol

  ঘ

  Magnesium hydroxide
• Which of the following is the suitable medium for preparing Grignard reagents?
  ক

  Dry acetone

  খ

  Dry ether

  গ

  Concentrated HCl

  ঘ

  Alcoholic KOH
• How many β-carbon atoms does 2-Bromobutane have?
  ক

  0

  খ

  1

  গ

  2

  ঘ

  3
• What is the correct order of reactivity of haloalkanes towards β-elimination reactions?
  ক

  1°>2°>3°

  খ

  3°>2°>1°

  গ

  1°>3°>2°

  ঘ

  3°>1°>2°
• The major product formed from the dehydrohalogenation of 2-Bromopentane is pent-2-ene.
  ক

  True

  খ

  False
• The heating of 1-Chlorobutane along with alcoholic KOH results in ________
  ক

  elimination of hydrogen from α-carbon atom

  খ

  elimination of hydrogen from β-carbon atom

  গ

  elimination of hydrogen from γ-carbon atom

  ঘ

  no reaction
• When (-)-2-bromooctane reacts with potassium hydroxide over an SN2 mechanism, what will be the product formed?
  ক

  (-)-octan-1-ol

  খ

  (+)-octan-1-ol

  গ

  (-)-octan-2-ol

  ঘ

  (+)-octan-2-ol
• What will be the effect on the plane of plane polarised light when it passes through a solution of dlbutan-2-ol?
  ক

  Clockwise rotation

  খ

  Anti-clockwise rotation

  গ

  Zero rotation

  ঘ

  180° rotation
• When a reaction proceeds with the retention of configuration, the optical activity of the product will remain same as that of the original reactant.
  ক

  True

  খ

  False
• What is the most suitable term for the following transformation?
  ক

  Inversion of configuration

  খ

  Retention of configuration

  গ

  Racemisation

  ঘ

  Elimination reaction
• The process of separation of a racemic mixture into the respective d and l optical isomers is called __________
  ক

  racemisation

  খ

  resolution

  গ

  inversion

  ঘ

  retention
• A chiral compound with an ‘X’ group attached to the stereocenter has been replaced by a ‘Y’ group. The product obtained rotates the plane of polarised light in the direction opposite to that of the original compound. Name the process that has taken place.
  ক

  Inversion

  খ

  Retention

  গ

  Racemisation

  ঘ

  Inversion or retention
• Predict the chirality of the shown compounds.
  ক

  Both A and B are chiral

  খ

  Both A and B are achiral

  গ

  A is chiral and B is achiral

  ঘ

  A is achiral and B is chiral
• What is the chirality of 2-Chlorobutane?
  ক

  Chiral

  খ

  Achiral

  গ

  Superimposable mirror images

  ঘ

  Symmetric
• Which of the following has a chiral carbon atom?
  ক

  2-Chloro-2-methylpentane

  খ

  1,1-Dibromoethane

  গ

  Pentan-3-ol

  ঘ

  2-Bromopentane
• Which of the following compounds does not have a stereocenter?
  ক

  Propan-2-ol

  খ

  Butan-2-ol

  গ

  2-Bromo-1-chlorobutane

  ঘ

  2-Bromopentane
• If a compound does not affect the plane of plane polarised light when passed through it, the compound is said to be _________
  ক

  optically active

  খ

  optically inactive

  গ

  dextrorotatory

  ঘ

  laevorotatory
• The SN1 reaction cannot be carried out in which of the following media?
  ক

  Acetic acid

  খ

  Acetone

  গ

  Ethanol

  ঘ

  Water
• As the stability of carbocation formed in the first step of SN1 reaction increases, the rate of the reaction _________
  ক

  increases

  খ

  decreases

  গ

  remains same

  ঘ

  may increase or decrease