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  4. The most polar bond is

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Q. The most polar bond is

Classification of Elements and Periodicity in Properties

Solution:

More the difference in electronegativities of elements, more polar will be the bond.
$\begin{array}{ll} Br - H & \Delta X=2.8-2.1 \Rightarrow & 0.7 \\ Cl - H & \Delta X=3.0-2.1 & \Rightarrow & 0.9 \\ O - H & \Delta X=3.5-2.1 & \Rightarrow & 1.4 \\ N - H & \Delta X=3.0-2.1 & \Rightarrow & 0.9\end{array}$