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Q. Electron deficient molecule is

Rajasthan PMTRajasthan PMT 2007Chemical Bonding and Molecular Structure

Solution:

The compounds in which central atom has less than $8$ electrons in their valence shell are electron deficient compounds.
(a) $CCl_4Cl - \underset{\overset{|}{C}l}{\overset{\underset{|}{C}l}{C}} - Cl$
Carbon (central atom) has $8$ electrons in valence shell, $4$ from carbon and $1$ electron each from four chlorine atom.
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Phosphorus (central atom) has $10$ electrons in valence shell, $5$ from $P$ and one each from five chlorine atoms.
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Boron (central atom) has $6$ electrons in valence shell, $3$ from boron and one each from three fluorine atoms.
$\because$ Boron in $BF _{3}$ has less than $8$ electrons.
$\therefore $ it is electron deficient molecule and is correct answer.
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Sulphur (central atom) has $12$ electrons in valence shell, $6$ from sulphur and one each from six fluorine atoms.