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Q: Order of basicity of amines in gaseous state?

  • 1
    2'> 1'> 3' > NH3
  • 2
    3' > 2' > 1'> NH3
  • 3
    1' > 2' > 3'> NH3
  • 4
    2'> 3'> 1' > NH3
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Answer : 2. "3' > 2' > 1'> NH3"
Explanation :

Answer: B) 3' > 2' > 1'> NH3 Explanation: The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.   So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.   But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.

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