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Q.

Which of the following species can act like  both Lewis acid and a Lewis base

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a

CCl4

b

SiCl4

c

SCl4

d

GeCl4

answer is C.

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Detailed Solution

CCl4....cannot expand valency....no lp on central atom to donate.....neither a LA nor a LB; SiCl4....can expand valency....no lp on central atom to donate.....only a LA but not a LB; GeCl4....can expand valency....no lp on central atom to donate....only a LA but not a LB; SCl4....can expand valency....one lp on central atom to donate....Both  LA and LB;
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