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12th Grade > Chemistry

HALOALKANES AND HALOARENES MCQs

Total Questions : 30 | Page 3 of 3 pages
Question 21. The odd decomposition of carbon chlorine bond form
 
[UPSEAT 1999]                                                                                                                   
  1.    Two free ions
  2.    Two-carbanium ion 
  3.    Two carbanion 
  4.    A cation and an anion
 Discuss Question
Answer: Option D. -> A cation and an anion
:
D
The Odd Decomposition Of Carbon Chlorine Bond Form [UPSEAT ...
Cl is more electronegative than C by which it form anion and hydrocarbon form cation.
Question 22. Grignard reagents (RMgX) are potential sources of carbanions because of
  1.    Polar C-Mg bond
  2.    +I effect of alkyl group
  3.    Solvent properties of ether with which it is stored
  4.    Their ability of react in any medium
 Discuss Question
Answer: Option A. -> Polar C-Mg bond
:
A
As C is more electronegative C-Mg bond becomes polarand it undergoes heterolytic cleavage to give carbanion
Question 23. Which of the following compounds would not give ppt. with AgNO3
  1.    CH3CH=CHCl
  2.    CH2=CH−CH2Cl
  3.    (CH3)3CCl
 Discuss Question
Answer: Option A. -> CH3CH=CHCl
:
A
Stable carbocations are produced from (b), (c), (d) but not from (a) as Chlorine is bonded to sp2 hybridized carbon and is a vinylic type of carbon.
Question 24. Which conformation of C6H6CI6 is most powerful insecticide
  1.    aaeeee
  2.    aaaeee
  3.    aaaaee
  4.    aaaaaa
 Discuss Question
Answer: Option B. -> aaaeee
:
B
aaaeee form is the most powerful insecticide form ofC6H6CI6.
Question 25. Arrange the following compounds in order of increasing dipole moment I. Toluene II. m-dichlorobenzene III. o-dichlorobenzene IV. p-dichlorobenzene
  1.    I
  2.    IV
  3.    IV
  4.    IV
 Discuss Question
Answer: Option B. -> IV
:
B
Arrange The Following Compounds In Order Of Increasing Dipol...
Question 26. When chlorobenzene is treated with NaNH2 in liquid ammonia at 196K, aniline is formed. This reaction takes place by
  1.    E1 mechanism
  2.    E2 mechanism
  3.    E1cB mechanism
  4.    Benzyne mechanism
 Discuss Question
Answer: Option D. -> Benzyne mechanism
:
D
When Chlorobenzene Is Treated With NaNH2 In Liquid Ammonia A...
Question 27. Ethylidene chloride on hydrolysis with ag.KOH gives 
  1.    CH3CHO
  2.    CH3COOH
  3.    CHCL3
  4.    CH3CH2OH
 Discuss Question
Answer: Option A. -> CH3CHO
:
A
Ethylidene Chloride On Hydrolysis With Ag.KOH Gives 
Question 28. The benzene diazonium chloride needed for the sandmeyer reaction to produce aromatic halides is produced by diazotisation reaction that takes place at
  1.    0−5∘C
  2.    5−10∘C
  3.    10−15∘C
  4.    15−20∘C
 Discuss Question
Answer: Option A. -> 0−5∘C
:
A
HNO2 is stable at low temperature. Therefore the reaction is carried out between 0−5∘
Question 29. A Grignard reagent is prepared by the action of magnesium in dry ether on
  1.    C2H5OH
  2.    C2H6
  3.    C2H5Cl
  4.    C2H5CN
 Discuss Question
Answer: Option C. -> C2H5Cl
:
C
A Grignard Reagent Is Prepared By The Action Of Magnesium In...
Question 30. Solution of (+) -2-chloro -2- phenylethane in toluene racemises slowly in the presence of small amount of SbCl5, due to the formation of
  1.    Carbanion
  2.    Carbene
  3.    Free-radical
  4.    Carbocation
 Discuss Question
Answer: Option D. -> Carbocation
:
D
Occurrence of racemization points towards the formation of carbocation as intermediate, which being planar can be attacked from either side

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