Which of the following are Lewis acids?A. BCl3 and AlCl3B. PH3 and BCl3C. AlCl3 and SiCl4D. PH3 and SiCl4BCl3BCl3
A Lewis acid is a species that can accept a pair of electrons. Let's analyze each option:
A. BCl3 and AlCl3:
BCl3 is a Lewis acid because boron has an incomplete octet and can accept an electron pair.
AlCl3 is also a Lewis acid because aluminum has an empty p orbital and can accept an electron pair.
B. PH3 and BCl3:
PH3 is not a Lewis acid because phosphorus is already bonded to three hydrogen atoms, forming a complete octet, and it doesn't have an empty orbital to accept electron pairs.
BCl3 is a Lewis acid for the same reason mentioned in option A.
C. AlCl3 and SiCl4:
AlCl3 is a Lewis acid as explained in option A.
SiCl4 is not a Lewis acid because silicon is surrounded by four chloride atoms, completing its octet, and it doesn't have empty orbitals to accept electron pairs.
D. PH3 and SiCl4:
PH3 is not a Lewis acid as explained in option B.
SiCl4 is not a Lewis acid because silicon is surrounded by four chloride atoms, completing its octet, and it doesn't have empty orbitals to accept electron pairs.
So, the correct choices are:
A. BCl3 and AlCl3
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