A) \[C{{H}_{3}}-CH_{2}^{-}>NH_{2}^{-}>H-C\equiv {{C}^{-}}>O{{H}^{-}}\]
B) \[H-C\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}^{-}>NH_{2}^{-}>O{{H}^{-}}\]
C) \[O{{H}^{-}}>N{{H}_{2}}^{-}>H-C\equiv {{C}^{-}}>C{{H}_{3}}-CH_{2}^{-}\]
D) \[N{{H}_{2}}^{-}>H-C\equiv {{C}^{-}}>O{{H}^{-}}>C{{H}_{3}}-CH_{2}^{-}\]
Correct Answer: A
Solution :
[a] Follow Lowry Bronsted concept for conjugate pair. Acid strength follows the order \[{{H}_{2}}O>{{C}_{2}}{{H}_{2}}>N{{H}_{3}}>{{C}_{2}}{{H}_{6}}\] conjugate base will follow the order \[{{C}_{2}}H_{5}^{-}>NH_{2}^{-}>{{C}_{2}}{{H}^{-}}~>O{{H}^{-}}~\]
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