A) \[N{{(C{{H}_{3}})}_{3}}>N{{(C{{H}_{3}})}_{2}}H>N(C{{H}_{3}}){{H}_{2}}>N{{H}_{3}}\]
B) \[N(C{{H}_{3}}){{H}_{2}}>N{{(C{{H}_{3}})}_{2}}H>N{{(C{{H}_{3}})}_{3}}>N{{H}_{3}}\]
C) \[N{{H}_{3}}N(C{{H}_{3}}){{H}_{2}}>N{{(C{{H}_{3}})}_{2}}H\] \[>\,N{{(C{{H}_{3}})}_{3}}\]
D) \[N{{(C{{H}_{3}})}_{2}}H>N(C{{H}_{3}}){{H}_{2}}>N{{(C{{H}_{3}})}_{3}}\]\[>N{{H}_{3}}\]
Correct Answer: D
Solution :
The order of basic strength for methyl substituted amine in aqueous solution is \[N{{(C{{H}_{3}})}_{2}}H>N(C{{H}_{3}}){{H}_{2}}>N{{(C{{H}_{3}})}_{3}}>N{{H}_{3}}\]This is due to the steric effect and solvent effect.
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