Which of the following order is correct against the mentioned property?

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$O_{2}^{2 -} > O_{2} > O_{2}^{+}$ (bond order)

$H_{2} O > {NH}_{3} > {NF}_{3}$ (dipole moment)

${AlF}_{3} > {MgF}_{2} > NaF$ (ionic character)

${BBr}_{3} > {BCl}_{3} > {BF}_{3}$ (bond angle

answer is A.

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Detailed Solution

Dipole moment $\propto \frac{1}{Bond-angle (θ)}$
Dipole moment is high in such compound which has its' polarity towards its' central atom.
Hence, the correct order of Dipole moment is $H_{2} O > {NH}_{3} > {NF}_{3} > {CH}_{4}$ .

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