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Haloalkanes and Haloarenes - ISC Class 12 Chemistry Questions with Answers, Page 3

47 past-paper questions on Haloalkanes and Haloarenes from ISC Class 12 Chemistry papers (2027-2018), newest first, in full. Questions 41-47 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.

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2022 · 2 marks · Short answerOpen: Conversion of Chlorobenzene into phenol. Which of the following statements is…
Conversion of Chlorobenzene into phenol.
(i)
Which of the following statements is correct for the above conversion?
  • (a)Heating it with alc. KOH at room temperature
  • (b)Heating it with aqueous NaOH at 623 K under pressure followed by acidification with dilute HCl
  • (c)Heating it with CuCN followed by acidification with dilute HCl
  • (d)Heating it with sodium metal in the presence of dry ether
(ii)
What is the name of the above reaction?
  • (a)Dow process
  • (b)Wurtz reaction
  • (c)Sandmeyer’s reaction
  • (d)Kolbe’s reaction

No answer yet.

2022 · 1 mark · Assertion-reasonOpen: Haloalkanes when treated with alcoholic KCN forms alkane nitrile as a major…

Assertion: Haloalkanes when treated with alcoholic KCN forms alkane nitrile as a major product.

Reason: Potassium cyanide is a covalent compound.

  • (a)Assertion is false but reason is true.
  • (b)Assertion is true but reason is false.
  • (c)Both assertion and reason are false.
  • (d)Both assertion and reason are true and reason is the correct explanation of the assertion.

No answer yet.

2022 · 2 marks · Short answerOpen: The reaction: The expected mechanism of the above reaction is: The above…
The reaction: $\text{CH}_3\text{Br} + \text{OH}^- \rightarrow \text{CH}_3\text{OH} + \text{Br}^-$
(i)
The expected mechanism of the above reaction is:
  • (a)SN1 mechanism
  • (b)SN2 mechanism
  • (c)SE1 mechanism
  • (d)SE2 mechanism
(ii)
The above reaction is:
  • (a)Elimination reaction
  • (b)Nucleophilic addition reaction
  • (c)Nucleophilic substitution reaction
  • (d)Electrophilic substitution reaction

No answer yet.

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