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Which of the following statement(s) is/are correct?

1. Al(CH3)3 has the three-centre two-electron bonds in its dimeric structure
2. AlCl3 has the three-centre two-electron bonds in its dimeric structure
3. BH3 has the three-centre two-electron bonds in its dimeric structure
4. The Lewis acidity of BCl3 is greater than that of AlCl3

Correct answer: Al(CH3)3 has the three-centre two-electron bonds in its dimeric structure

Solution

Al(CH3)3 dimerises (Al2Me6) with electron-deficient 3c-2e Al-C-Al bridges, just like B2H6; AlCl3 dimerises via ordinary Cl-bridge dative bonds, and BCl3 is actually a weaker Lewis acid than expected. The standard correct choice is the Al(CH3)3 statement.

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