question_answer

Which of the following molecules has trigonal planer geometry                 [CBSE PMT 2005]

A)                 \[I{{F}_{3}}\]     

B)                 \[PC{{l}_{3}}\]

C)                 \[N{{H}_{3}}\]  

D)                 \[B{{F}_{3}}\]

Correct Answer: D

Solution :

           No. of e? pair\[=3+\frac{1}{2}[3-3]\]=0                     No. of e? pair\[=3\]+0             No. of atom bonded to the central atom \[=3\]                    In case of 3, 3 geometry is Trigonal planar.