According to basic strength,If true enter 1, else enter 0.
$I^{-} < {B r}^{-} < {C l}^{-} < F^{-}$

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Solution

The increasing order of the acid strength is
$H F < H C l < H B r < H I$
Thus, HF is the weakest acid and HI is the strongest acid.
Weakest acid (HF) has strongest conjugate base $(F^{-})$
and strongest acid (HI) has weakest conjugate base $(I^{-})$ .
Hence, the increasing order of the basic strength is
$I^{-} < {B r}^{-} < {C l}^{-} < F^{-}$ .

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