In which of the following all the given characteristics are present ?
Vacant orbitals involved in hybridization
Octet of underlined atom is completed
Geometry of underlined atom is tetrahedral

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${\underline{B}}_{2} H_{6}$

${Si}_{2} H_{6}$

$I_{2} {Cl}_{6}$

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

answer is C.

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Detailed Solution

Low melting and boiling points are characteristics of aluminum chloride. 180 C is the temperature at which it sublimes . ${Al}_{2} {Cl}_{6}$ is a poor conductor of electricity when it is molten. Aluminum chloride is typically white in color but turns yellow when it comes into contact with iron trichloride.

Vacant orbitals in ${Al}_{2} {Cl}_{6}$ participate in hybridization. The underlined atom's octet is full in ${Al}_{2} {Cl}_{6}$ , while its geometry is tetrahedral in ${Al}_{2} {Cl}_{6}$ . The answer that is correct is therefore (c).