In the conventional Lewis (dative-bond) description of the dimer Al2Cl6, the number of coordinate (dative) bonds is

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In the conventional Lewis (dative-bond) description of the dimer $Al X_{2} Cl X_{6}$ , the number of coordinate (dative) bonds is

A $0$
B $1$
C $2$
D $4$

Answer: C

Each aluminium of the dimer completes its octet by accepting a lone pair from a bridging chlorine of the other half. Two bridging Cl atoms therefore each form one dative bond, giving 2 coordinate bonds.

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In the conventional Lewis (dative-bond) description of the dimer AlX2​ClX6​, the number of coordinate (dative) bonds is

Answer: C

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In the conventional Lewis (dative-bond) description of the dimer $Al X_{2} Cl X_{6}$ , the number of coordinate (dative) bonds is