Understanding nature of 3c-4e bonding in HF2-, Al2Cl6, solid polymeric BeCl2, transition state of SN2 etc

HF2- has 3c-4e strongest symmetric H-bonding

Al2Cl6 is sp3 hybridised having 3c-4e bonds

AlCl3(s) is sp2

whereas AlCl3 in vapor phase or in non-polar solvent is dimeric Al2Cl6 hence sp3

In transition state of SN2, carbon is pentavalent but sp2 hybridised having 3c-4e bonds

BeCl2(g) is sp hybridised, linear molecule, like HgCl2

whereas Solid BeCl2 is polymeric and sp3 hybridised having 3c-4e bonds

Errata!! in video, its GaH4Cl2 rather than GaH2Cl2

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