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Class XII · Chemistry

Organic Compounds Containing Halogens: NEET MCQ practice

118 practice questions on Organic Compounds Containing Halogens, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

118

Practice questions

50

Easy

63

Medium

5

Hard

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What Organic Compounds Containing Halogens covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • General methods of preparation, properties and reactions of haloalkanes and haloarenes
  • Nature of C-X bond, mechanisms of substitution reactions
  • Uses; environmental effects of chloroform, iodoform, freons and DDT

Sample questions on Organic Compounds Containing Halogens

Try each one, then open the answer and explanation.

Question 1 · Practice question

The yield of alkyl bromide obtained as a result of heating the dry silver salt of carboxylic acid with bromine in CCI₄ is

  1. A.1°> 3°> 2° bromides
  2. B.3 ° > 2° > 1°bromides
  3. C.1°> 2° > 3° bromides
  4. D.3 ° > 1°> 2 ° bromides
Show answer

Answer: B. 3 ° > 2° > 1°bromides

This is the Hunsdiecker reaction, which follows a free‑radical mechanism. The ease of formation of alkyl radicals determines the yield: tertiary radicals are most stable, so tertiary alkyl bromides are obtained in highest yield; secondary radicals are next, and primary radicals are least stable, giving the lowest yield. Option (b) correctly reflects this order of radical stability.

Question 2 · Practice question

Which is incorrect about Hunsdiecker's reaction?

  1. A.Only Cl₂ can give alkyl halide.
  2. B.I₂ will give ester when treated with RCOOAg.
  3. C.The reaction proceeds through free radical.
  4. D.F₂ cannot give alkyl halide.
Show answer

Answer: A. Only Cl₂ can give alkyl halide.

Hunsdiecker reaction uses Br₂ most commonly; Cl₂ and I₂ can also give products, so stating that only Cl₂ gives alkyl halide is wrong. Option (b) is correct because iodine tends to form esters, (c) is correct as it's a free-radical mechanism, and (d) is correct because fluorine is too violent to give clean alkyl fluoride via this reaction.

Question 3 · Practice question

The reaction of SOCI₂ on alkanols to form alkyl chlorides gives good yields because

  1. A.alkyl chlorides are immiscible with SOCI₂
  2. B.the other products of the reaction are gaseous and escape out
  3. C.alcohol and SOCI₂ are soluble in water
  4. D.the reaction does not occur via intermediate formation of an alkyi chlorosulphite
Show answer

Answer: B. the other products of the reaction are gaseous and escape out

Thionyl chloride (SOCl₂) reacts with alcohols to form alkyl chlorides, with sulfur dioxide and hydrogen chloride as by-products. Both are gases that escape, shifting the equilibrium toward the product and giving high yields. The other options are incorrect — miscibility and water solubility are irrelevant, and the reaction does indeed go through an alkyl chlorosulfite intermediate in some conditions.

Question 4 · Practice question

The IUPAC name of chloroform is:

  1. A.Dichloromethane
  2. B.Trichloromethane
  3. C.Chloromethane
  4. D.Carbon tetrachloride
Show answer

Answer: B. Trichloromethane

Chloroform is the common name for CHCl₃, which, by IUPAC rules, is named as trichloromethane. It is a simple recall fact from halogen derivatives of alkanes. The other options are incorrect: dichloromethane (CH₂Cl₂), chloromethane (CH₃Cl), and carbon tetrachloride (CCl₄) are different compounds.

Question 5 · Practice question

Which among the following is true?

  1. A.Freon does not initiate radical chain reactions in stratosphere.
  2. B.Iodoform initiates radical chain reactions in stratosphere.
  3. C.Freon initiates radical chain reactions in stratosphere.
  4. D.Chloroform initiates radical chain reactions in stratosphere.
Show answer

Answer: C. Freon initiates radical chain reactions in stratosphere.

Freons (chlorofluorocarbons) are stable compounds that reach the stratosphere and under UV light release chlorine radicals, which catalyze ozone depletion via radical chain reactions. Option (a) is the direct opposite and is false. Options (b) and (d) are incorrect because iodoform and chloroform are not significant contributors to stratospheric radical chain reactions like freons are.

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