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Which one of the following is most reactive of SN1 reaction?
  1. C6H5Cl
  2.  Description: 45322.png
  3. Description: 45335.png
  4. Description: 45347.png
Solution (D)
The formation of carbocation is the slowest step, so the most stable carbocation will lead to the fastest SN1 reaction. Description: 45360.png is allylic, which is stabilized by delocalization.


How many structural isomers are possible for compounds having the molecular formula C5H11Br?
  1. 5
  2. 6
  3. 7
  4. 8
Solution (D)
  1. C – C – C – C – C – Br
  2. Description: 45368.png
  3. Description: 45376.png
  4. Description: 45384.png
  5. Description: 45392.png
  6. Description: 45399.png
  7. Description: 45408.png
  8. Description: 45415.png


Rank the following compounds in the order of increasing E2 reaction rate with alcoholic KOH:
Description: 45878.png
  1. A < C < B
  2. C < B < A
  3. A < B < C
  4. B < A < C
Solution (C)
In E2 mechanism, both the leaving group and H are removed simultaneously, and as C2H5O| base is not bulky, therefore is more stable, which means more alkylated alkene will form.
  1. Description: 45888.png
  2. Description: 45896.png
  3. Description: 45906.png


Which of the following can be used to prepare 3–bromopropene?
  1. Description: 45427.png
  2. Description: 45439.png
  3. Description: 45452.png
  4. Description: 45459.png
Solution (B)
Allylic substitution takes place with NBS.
Description: 45466.png
Option (a) will give addition product.
Description: 45921.png


Which of the following substrate is most reactive towards methoxide ion (Me – Description: 45477.png)?
  1. CH3 – I
  2. Description: 45932.png
  3. CH3 – O – SO2 – CF3
  4. CH3 – F
Solution (B)
Description: 45485.png
In the presence of weak base, E1 reaction will occur, whereas in the presence of strong base, E2 will occur. But for SN2 mechanism, 1° alkyl halide is required.

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