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How many of the following are Lewis acidsCCl4,SiCl4,NH3,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,AlCl3central atoms B,Al have vacant p-orbitals and Incomplete octet thus they behave as Lewis acids SiCl4can 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 acidsCCl4,SiCl4,NH3,BCl3,AlCl3,CH4