MCQ
Which of the following is a Lewis acid?
- A$PH_3$
- B$NF_3$
- C$NaH$
- ✓$B(CH_3)_3$

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$PC{l_{3(g)}}\, + \,C{l_2}(g)\, \rightleftharpoons \,PC{l_{5(g)}}$
