Which of the following is the strongest bond?

N a - C l

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C s - C l

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Both

(A)

and

(B)

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None of these

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Solution

The correct option is A $N a - C l$
According to Fazan's rule, a large cation with small positive charge has less polarizability there by forming strong ionic compound. between $N a C l$ & $C s C l$ , ${N a}^{+}$ & ${C s}^{+}$ have same charge of $+ 1$ unit.
And, ${C s}^{+}$ is bigger than ${N a}^{+}$ .
So, ${N a}^{+}$ will cause more polarization. Higher polarization of anion, greater is the covalent character & lower ionic character.
Hence, $C s C l$ has more ionic character than $N a C l$ .
Higher the ionic character lower is the bond strength.
Hence, the correct answer is A.

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N a

C l

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