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Question

Assertion :SiF26 is known but SiCl26 is not known. Reason: Interaction of F lone pair electrons with Si is stronger than that of chlorine and due to smaller size of F steric repulsion will be less.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The size of fluorine is small therefore can be easily arranged around Silicon to form SiF26 while the size of chlorine is large enough which create steric hindrance to each other therefore cannot be arranged around silicon in excess.

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