Among the following molecules:

The number of molecules that possess an incomplete octet on the central atom is $' x'$ and the number of molecules with an expanded octet on the central atom is $' y'$ , then $(y - x)$ is:

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answer is 3.

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Detailed Solution

Molecules with incomplete octet $B C l_{3}, A l C l_{3}, B e C l_{2}$ $(x = 3)$ . Molecules in which the central atom has an expanded octet are : $I F_{7}, S F_{4}, I C l_{3}, P C l_{5}, S F_{6}, X e F_{2} (y = 6)$ $y - x = 3$

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