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Assertion : $\mathrm{AlCl}_3$ exists as a dimer through halogen bridged bonds.
Reason : $\mathrm{AlCl}_3$ gets stability by accepting electrons from the bridged halogen.
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Reason : $\mathrm{AlCl}_3$ gets stability by accepting electrons from the bridged halogen.
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Both (A) and (R) are true and (R) is the correct explanation of (A)
$\mathrm{AlCl}_3$ exists as a dimer through halogen bridged bonds. In dimer $\mathrm{Al}_2 \mathrm{Cl}_6$ aluminium completes its octet through coordinates bond by chloine atom.
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