Q.

How many of the following are Lewis acids?CCl4,SiCl4,PH3,BCl3,AlCl3,CH4

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answer is 3.

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Detailed Solution

BCl3,AlCl3 and SiCl4 are Lewis acids.In BCl3,AlCl3 central atoms B,Al have vacant p-orbitals and Incomplete octet thus they behave as Lewis acids. SiCl4 can accept lone pair of electron in d-orbitals of silicon.  Hence it can acts as Lewis acid.
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How many of the following are Lewis acids?CCl4,SiCl4,PH3,BCl3,AlCl3,CH4