Find the number of hypervalent compounds among the following.
$B F_{3}, S F_{4}, N C l_{3}, P C l_{5}, S i F_{4}, B r F_{5}, X e F_{2}, B e C l_{2}$

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Solution

According to Lewis octet rule, an atom tends to have maximum of 8 electrons in their valence shells. Those that contain less than 8 electrons in their valence shell are called hypovalent and those contains more than 8 electrons in their valence shell are called hypervalent.

$S F_{4}, P C l_{5}, B r F_{5} a n d X e F_{2}$ are hypervalent compounds.
$S F_{4}, P C l_{5} a n d X e F_{2}$ contain 10 electrons and $B r F_{5}$ contains 12 electrons in their valence shells.

$B F_{3} a n d B e C l_{2}$ contain 6 and 4 electrons respectively in their valence shells. They are hypovalent compounds.

$N C l_{3} a n d S i F_{4}$ are normal compounds.

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Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3

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Among the following, the number of compounds which do not hydrolyze

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