Tag: polyhalogen compounds

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Questions Related to polyhalogen compounds

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DDT and BHC 

both are good insecticides
since highly soluble in coater.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) Carbon tetra-chloride is colorless, non inflammable and is used as a fire extinguisher. 

B) Methylene chloride is used as a paint remover. 
C) DDT is the chlorinated organic and non biodegradable insecticide. 
D) Freons are produced for aerosol propellants, refrigerators and air conditioners. 

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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. $C _3H _7Br$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\delta$=179-167=12, w=0.0852g, W=2g,Kf= 40 
Moleculer weight of (A)
=$\dfrac{1000\times{Kf}\times{w} }{\delta{T}\times {W}}$
=$\dfrac{1000\times{40}\times{0.0852} }{\delta{12}\times {2}}$
=142
(A) undergoes wortz reaction to form (B) i.e
$(A)\rightarrow{Na} (B)+NaX$
(B) is an alkane say $C _nH _2n+2$
$\therefore$ 280 mL of (B) weighs 0.375 g at NTP
$\therefore$ 22400 mL of (B) weighs 
=$\dfrac{0.375\times{22400}}{280}$
=30 g at NTP
M.wt of (B)=30, 12n+2n+2=30,n=2
Thus (B) is ethane and therefore (A) is $CH _3X$
The m.wt of $CH _3X$=142
At.wt of X=127
$\therefore$ is iodine 
Therefore alkyl halide is $CH _3I$.
This reaction is 
2$CH _3I\xrightarrow[Na]{ether} C _2h _6$
(A)                         (B)

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chloroform is known to have toxic effects when inhaled, including dizziness, fatigue, and heart issues, even at relatively low concentrations.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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

  1. $CHCl _{3}$
  2. $CHI _{3}$
  3. $CH _{2}Cl _{2}$
  4. $C _{6}H _{6}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chloroform is used as solvent and as anaesthetic.
$CHI _3$ is used as antiseptic.
$CH _2Cl _2$ is used for metal cleaning and finishing.
$C _6H _6$ is used for printing and lithography, paint, rubber, dry cleaning, adhesives and coatings, detergents.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since, the product is a pleasent smelling liquid, it must be an ether. $C _2H _5I$ forms diethyl ether on reaction with dry silver oxide.

Hence $X$ is an dry silver oxide.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

What is not a polyhalogen?

  1. Methyl chloride

  2. Dichloro methane

  3. Chloroform

  4. Carbon tetrachloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A polyhalogen compound contains more than one halogen atom in its molecule. Methyl chloride (CH3Cl) contains only one chlorine atom, making it a monohalogen compound, not a polyhalogen.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Bayer's reagent is

  1. $Br _{2}/CCl _{4}$
  2. Cold, dilute alkaline $KMnO _{4}$
  3. Acidified $KMnO _{4}$
  4. $O _{3}/Zn/H _{2}O$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bayer's reagent is defined as a cold, dilute, alkaline solution of potassium permanganate (KMnO4). It is used to test for unsaturation in organic compounds, where it turns from purple to brown.