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Polyhalogen compounds - class-XII

Covers properties, reactions, and applications of polyhalogen compounds including chloroform, carbon tetrachloride, DDT, insecticides, and industrial solvents

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following statements is not correct?

  1. DDT and BHC are not good insecticides because they are highly soluble in water.
  2. DDT and BHC are not good insecticides because they are absorbed by the soil and contaminate root corps.
  3. Aldrin is not a good insecticide because it is not biodegradable.
  4. All of the above are incorrect.
Question 2 Multiple Choice (Single Answer)

Match the column I with column II.

Columns I  Columns II 
A Carbon tetrachloride  i Paint remover 
B Methylene chloride  ii Refrigerators and air conditioners 
C DDT iii Fire extinguisher 
D Freons iv Non biodegradable insectiside 
  1. A=(ii), (B)=(iii), (C)=(i), (D)=(iv)
  2. A=(i), (B)=(ii), (C)=(iii), (D)=(iv)
  3. A=(iv), (B)=(iii), (C)=(ii), (D)=(i)
  4. A=(iii), (B)=(i), (C)=(iv), (D)=(ii)
Question 3 Multiple Choice (Single Answer)

0.0852 g of an organic halide (A) when dissolved in 2.0 g of camphor, the melting point of the mixture was found to be $167^{\circ}$C. Compound (A) when heated with sodium gives a gas (B). 280 mL of gas (B) at STP weighs 0.375g. What would be 'A' in the whole process? $K _f$ for camphor = 40, m.pt. of camphor = $179^{\circ}$C.

  1. $C _2H _5Br$
  2. $CH _3I$
  3. $(CH _3) _2CHI$
  4. $C _3H _7Br$
Question 4 Multiple Choice (Single Answer)

Breathing about 900 parts this substance per million parts of air for a short time cause dizziness heart & fatigue headache is-

  1. Methylene choride
  2. Chloroform
  3. Iodoform
  4. Tetra chlorometane
Question 5 Multiple Choice (Single Answer)

Chloropicrin is ______.

  1. picric derivative
  2. nitrochloroform
  3. nitromethane
  4. nitroethyl chloride
Question 6 Multiple Choice (Single Answer)

Which of the following is used for metal cleaning and finishing?

  1. $CHCl _{3}$
  2. $CHI _{3}$
  3. $CH _{2}Cl _{2}$
  4. $C _{6}H _{6}$
Question 7 Multiple Choice (Single Answer)

Consider the following reaction $C _2H _5I \xrightarrow[x]{\triangle} $ (Pleasant smelling liquid) X is?

  1. Sodium
  2. Dry silver oxide
  3. Ethyl chloride
  4. Dry silver powder
Question 8 Multiple Choice (Single Answer)

What is not a polyhalogen?

  1. Methyl chloride
  2. Dichloro methane
  3. Chloroform
  4. Carbon tetrachloride
Question 9 Multiple Choice (Single Answer)

Which of the following compounds will give haloform test?
(i) $CH _3COCH _2l$
(ii) $CH _3CHCl-CH _3$
(iii) $C _6H _5COCH _3$
(iv) $CH _3CH _2Br$
The correct answer is

  1. $I,II$
  2. $III,IV$
  3. $II,III$
  4. $I,II,III,IV$
Question 10 Multiple Choice (Single Answer)

Acidity of fluoroform (I), bromoform (II), iodoform (III) and chloroform (IV) in decreasing order is as follows:

  1. I> II> III> IV
  2. IV> III> II> I
  3. IV> I> II> III
  4. IV> I> III> II
Question 11 Multiple Choice (Single Answer)

Which of the following is used in paint removing ?

  1. $CHCl _{3}$
  2. $CH _{2}Cl _{2}$
  3. $CCl _{4}$
  4. $CH _{3}Cl$
Question 12 Multiple Choice (Single Answer)

Carbon tetrachloride is inflammable. 

  1. True
  2. False
Question 13 Multiple Choice (Single Answer)

Chocolates and fatty foods containing butter or oil sometimes leave stains on clothes that are difficult to remove. They can be removed by:

  1. a solution of salt in water
  2. tetrachloroethylene
  3. water
  4. alcohol
Question 14 Multiple Choice (Single Answer)

Alkaline hydrolysis of 1,1,1-trichloro derivative (A) of an alkane gives a molecule (B) which produces red coloration with aqueous ${ FeCl } _{ 3 }$. The compound (A) is ?

  1. ${ CH } _{ 3 }{ CH } _{ 2 }{ CCl } _{ 3 }$
  2. ${ CH } _{ 3 }{ CCl } _{ 3 }$
  3. ${ CH }{ Cl } _{ 3 }$
  4. None of these
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