Which one is a Lewis acid [RPMT 1997]

1.	Which one is a Lewis acid [RPMT 1997]
A.	\[Cl{{F}_{3}}\]
B.	\[{{H}_{2}}O\]
C.	\[N{{H}_{3}}\]
D.	None of these
Answer» B. \[{{H}_{2}}O\]

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Which one is a Lewis acid [RPMT 1997]

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