Arrange in increasing order of basicity:
${{C H}_{3} C O O}^{-}, {C F}_{3} {O C H}_{2}^{-}, {C H}_{3} S e {C H}_{2}^{-}$

{{C H}_{3} C O O}^{-} < {C H}_{3} S e {C H}_{2}^{-} < {C F}_{3} {O C H}_{2}^{-}

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{{C H}_{3} C O O}^{-} = {C F}_{3} {O C H}_{2}^{-} = {C H}_{3} S e {C H}_{2}^{-}

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{{C H}_{3} C O O}^{-} > {C F}_{3} {O C H}_{2}^{-} > {C H}_{3} S e {C H}_{2}^{-}

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{{C H}_{3} C O O}^{-} < {C F}_{3} {O C H}_{2}^{-} < {C H}_{3} S e {C H}_{2}^{-}

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Solution

The correct option is A ${{C H}_{3} C O O}^{-} < {C F}_{3} {O C H}_{2}^{-} < {C H}_{3} S e {C H}_{2}^{-}$
Acetic acid is the strongest acid and dimethyl selenide is the weakest acid.
Weakest acid (dimethylselenide) has strongest conjugate base ${C H}_{3} S e {C H}_{2}^{-}$ and strongest acid (acetic acid) has weakest conjugate base ${{C H}_{3} C O O}^{-}$ .
Hence, the increasing order of the base strength is
${{C H}_{3} C O O}^{-} < {C F}_{3} {O C H}_{2}^{-} < {C H}_{3} S e {C H}_{2}^{-}$ .

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