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JEE Main201912 Apr 2019Morning ShiftChemistryGeneral Organic ChemistryActual

The increasing order of the p K b of the following compund is: ( A ) ( B ) ( C ) ( D )

Options

  1. A( B ) < ( D ) < ( C ) < ( A )
  2. B( B ) < ( D ) < ( A ) < ( C )
  3. C( C ) < ( A ) < ( D ) < ( B )
  4. D( A ) < ( C ) < ( D ) < ( B )

Correct answer

B. ( B ) < ( D ) < ( A ) < ( C )

Step-by-step solution

p K b = - log &#8289; k b &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; k b &#8593; p k b &#8595; Basic character in amine and its derivative &#945; -ve charge density &#945; availability of lone pair &#945; + M &#160; &#160; &#945; &#160; 1 - M &#945; + H C &#160; &#160; &#945; &#160; 1 - H C &#945; + I &#160; &#160; &#945; &#160; 1 - I K b basic character B &#62; D &#62; A &#62; ( C ) pK b = B &#60; D &#60; A &#60; C

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