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JEE Main levelSingle correct optionDifficulty 2 of 3pb022

In the vapour phase aluminium chloride exists as $Al X_{2} Cl X_{6}$ . The number of bridging chlorine atoms and the hybridisation of each Al are

A3 and $s p^{2}$
B2 and $s p^{3}$
C4 and $s p^{3} d$
D2 and $s p^{2}$

Answer: B

Each Al in

Al X_{2} Cl X_{6}

is bonded to two terminal Cl atoms and two bridging Cl atoms (the latter through a dative bond from Cl). Four electron pairs around Al means

s p^{3}

, a tetrahedral environment. So 2 bridging Cl and

s p^{3}

.

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