1.

Which of the following is Lewis acid [NCERT 1978; EAMCET 1987; MP PET 1994; CPMT 1990; AFMC 1997; RPMT 1999]

A.        \[B{{F}_{3}}\]    
B.        \[C{{l}^{-}}\]
C.        \[{{H}_{2}}O\]  
D.        \[N{{H}_{3}}\]
Answer» B.        \[C{{l}^{-}}\]


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