A) \[{{H}_{3}}CCH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}\]
B) \[HC\equiv {{C}^{-}}>C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>O{{H}^{-}}\]
C) \[O{{H}^{-}}>NH_{2}^{-}>CH\equiv {{C}^{-}}>{{H}_{3}}CCH_{2}^{-}\]
D) \[NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}>{{H}_{3}}CCH_{2}^{-}\]
Correct Answer: A
Solution :
The conjugate acids of\[\overline{O}H,\overline{N}{{H}_{2}},\text{ }HC\equiv {{C}^{-}}\]and\[C{{H}_{3}}CH_{2}^{-}\]are\[{{H}_{2}}O,N{{H}_{3}},\text{ }HC=CH\]and \[C{{H}_{3}}C{{H}_{3}}\]respectively. Their acidic strength is as: \[HOH>HC\equiv CH>N{{H}_{3}}>C{{H}_{3}}C{{H}_{3}}\] A strong acid has a weak conjugate base, hence, the decreasing order of basic strength is: \[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}\]
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