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12th Grade > Chemistry

REACTION MECHANISM MCQs

Total Questions : 15 | Page 2 of 2 pages
Question 11.
 Discuss Question
Answer: Option A. ->
:
D
Question 12. The rate of SN2 reaction is maximum when the solvent is
  1.    CH3OH
  2.    H2O
  3.    DMSO 
  4.    Benzene
 Discuss Question
Answer: Option C. -> DMSO 
:
C
Polar aprotic solvents such as DMSO increase the rate of the SN2 reaction.
Question 13. The structure of the major product formed in the following reaction is
The Structure Of The Major Product Formed In The Following R...      
 Discuss Question
Answer: Option C. -> DMSO 
:
D
Alkyl halides are more reactive than aryl halides, therefore the halogen present on the side chain is displaced.
Question 14. The order of decreasing nucleophilicity is
  1.    H2O>OH−>CH3COO−>CH3O−
  2.    CH3COO−>CH3O−>HO−>H2O
  3.    HO−>CH3O−>CH3COO−>H2O
  4.    CH3O−>OH−>CH3COO−>H2O
 Discuss Question
Answer: Option D. -> CH3O−>OH−>CH3COO−>H2O
:
D
1. Due to the presence of -ve charge CH3O, OH,CH3COO , are more nucleophilic than H2O. Further due to + I effect of the CH3 group, CH3O is more nucleophilic than OH.
2. CH3COO has the -ve charge on oxygen stabilized by resonance and therefore its nucloephilicity is less than those of CH3O and OH.
Question 15. (i) What is the major mononitration product of PhCOOPh when it is reacted in a nitrating mixture?
(ii) Which of the following are formed when PhCOOH reacts with CH3MgI ?
  1.    (i) Ph−COO−Ph−NO2 - ortho product (ii) Phenol
  2.    (i) Ph−COO−Ph−NO2 - para product (ii) Benzene
  3.    (i) Ph−COO−Ph−NO2 - para product (ii) Ph−CH3
  4.    (i) Ph−COO−Ph−NO2 - ortho product (ii) Methane
 Discuss Question
Answer: Option D. -> (i) Ph−COO−Ph−NO2 - ortho product (ii) Methane
:
D
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