Which of the following molecule has complete octet?

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$B_{2} H_{6}$

${Al}_{2} {Cl}_{6}$

${Be}_{2} {Cl}_{4}$

${BeH}_{2}$

answer is B.

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Detailed Solution

Al uses its three valence electrons to bond with three chlorine atoms. But Al has only six electrons surrounding it, which is two fewer than an octet. To complete its octet, it borrows electrons from chlorine atoms in other aluminium chloride molecules.

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