JEE Questions for Chemistry Haloalkanes And Haloarenes Quiz 7 - MCQExams.com

The reactivity order of halides for dehydro halogenation is
  • R – F > R – Cl >R – Br > R – I
  • R – I > R – Br > R – Cl > R – F
  • R – I > R – Cl > R – Br > R – F
  • R – F > R – I > R – Br > R – Cl
Identify the set of reagent/reaction conditions ‘X’ and ‘Y’ in the following set of transformations :
Chemistry-Haloalkanes and Haloarenes-4526.png
  • X=dilute aqueous NaOH, 20oC; Y=HBr/acetic acid, 20oC
  • X= concentrated alcoholic NaOH, 80oC ; Y = HBr/acetic acid, 20o C
  • X = dilute aqueous NaOH, 20oC; Y = Br2/CHCl3, OoC
  • X=concentrated alcoholic NaOH, 80oC; Y=Br2/CHCl3, 0oC
An Sn2 reaction at an asymmetric carbon of a compound always gives
  • an enantiomer of the substrate
  • a product with opposite optical rotation
  • A mixture of diastereomers
  • A single isomer
At higher temperature, iodoform reaction is given by
  • CH3CO2CH3
  • CH3CO2C2H5
  • C6H5CO2CH3
  • CH3CO2C6H5
Consider the following compounds:
I. DDT II. Gammexane
III. Carbon tetrachloride IV. Chlorobenzene
The correct sequence of these compounds in the increasing order of percentage of chlorine in them is
  • III, II , I, IV
  • IV, II, I, III
  • III, I ,II, IV
  • IV, I, II, III
Bottles containing C6H5I and C6H5CH2I lost their original labels. They were labelled A and B for testing .A and B were separately taken in testtubes and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO3 and some AgNO3 solution added. Solution B gave a yellow precipitate. Which one of the following statements is true for the experiment ?
  • Addition of HNO3 was unnecessary
  • A was C6H5I
  • A was C6H5CH2I
  • B was C6H5I
Among the following the molecule with highest dipole moment is
  • CH3Cl
  • CH2Cl2
  • CHCl3
  • CCl4
The major product formed in the reaction

  • Chemistry-Haloalkanes and Haloarenes-4530.png
  • 2)
    Chemistry-Haloalkanes and Haloarenes-4531.png

  • Chemistry-Haloalkanes and Haloarenes-4532.png

  • Chemistry-Haloalkanes and Haloarenes-4533.png
The best method to prepare neopentyl chloride is

  • Chemistry-Haloalkanes and Haloarenes-4535.png
  • 2)
    Chemistry-Haloalkanes and Haloarenes-4536.png

  • Chemistry-Haloalkanes and Haloarenes-4537.png

  • Chemistry-Haloalkanes and Haloarenes-4538.png
1,4 – Dibromobutane (0.1 mole ) is treated with Na2S (0.1 mole) is aqueous ethanol, the product formed is
  • BrCH2CH2CH2CH2SH
  • HSCH2CH2CH2CH2SH
  • BrCH2CH2CH2S–Na+

  • Chemistry-Haloalkanes and Haloarenes-4540.png

Chemistry-Haloalkanes and Haloarenes-4542.png

  • Chemistry-Haloalkanes and Haloarenes-4543.png
  • 2)
    Chemistry-Haloalkanes and Haloarenes-4544.png

  • Chemistry-Haloalkanes and Haloarenes-4545.png

  • Chemistry-Haloalkanes and Haloarenes-4546.png
What will be the product of the following reaction
Chemistry-Haloalkanes and Haloarenes-4548.png

  • Chemistry-Haloalkanes and Haloarenes-4549.png
  • 2)
    Chemistry-Haloalkanes and Haloarenes-4550.png

  • Chemistry-Haloalkanes and Haloarenes-4551.png

  • Chemistry-Haloalkanes and Haloarenes-4552.png
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