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Example-1

Example-1
Number of structural isomers of C4H10O are
  1. 3
  2. 6
  3. 7
  4. 10
Solution (C)
C4H10O have 7 isomers out of which 4 are alcohols and 3 are ethers.
  1. Description: 40171.png,
  2. Description: 40182.png
  3. Description: 40191.png
  4. Description: 40201.png
  5. Description: 40258.png
  6. Description: 40247.png
  7. Description: 40229.png

Example-2

Example-2
Which one of the following species is most stable?
  1. p-O2N – – C6H4 – – C +H2
  2. p-CH3O – – C6H4 – – C +H2
  3. p-Cl – – C6H4 – – C +H2
  4. C6H5 – – C +H2
Solution (B)
Description: 40299.png
 
Nitro-group is electron withdrawing; therefore decreases stability.
 
Description: 40284.png
 
Methoxy group is electron releasing; therefore increases stability by donating electron.
 
Description: 40316.png
 
Chlorine is also electron withdrawing but its effect is less than – NO2 group.
 
Hence, the correct order of stability is
 
Description: 40327.png
 

Example-3

Example-3
How many enantiomer pairs are obtained by monochlorination of 2, 3-dimethylbutane?
  1. Nil
  2. Four
  3. Two
  4. One
Solution (D)
Description: 40337.png
 
Due to the presence of chiral carbon, it shows the optical activity and its mirror image are non-superimposable. Hence, it shows one enantiomer pair.
 
Description: 40349.png
 

Example-4

Example-4
The molecular formula of diphenyl methane,
 
Description: 40359.png, is C13H12
 
How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?
  1. 8
  2. 7
  3. 6
  4. 4
Solution (D)
Only four structural isomers are possible for diphenyl methane.
 
Description: 40369.png
 

Example-5

Example-5
Total number of isomers of C6H14 are
  1. 4
  2. 5
  3. 6
  4. 7
Solution (B)
  1. Description: 40381.png
  2. Description: 40389.png
  3. Description: 40469.png
  4. Description: 40447.png
  5. Description: 40454.png




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