Correct order of electronegativity difference between bonded atoms is:

N a C l < A l C l_{3} < M g C l_{2}

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A l C l_{3} < M g C l_{2} < N a C l

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N a C l < M g C l_{2} < A l C l_{3}

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M g C l_{2} < N a C l < A l C l_{3}

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Solution

The correct option is B $A l C l_{3} < M g C l_{2} < N a C l$
Na, Mg and Al belongs to same period and we know that from left to right in a period electronegativity increases so electronegativity order will be Na < Mg < Al
Here, electronegativity difference follow the order
$A l C l_{3} < M g C l_{2} < N a C l$

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