A) Every\[A{{B}_{5}}\]molecule does in fact has square pyramid structure.
B) Multiple bonds are always shorter than corresponding single bonds.
C) The electron-deficient molecules can act as Lewis acids.
D) The canonical structures have no real existence.
Correct Answer: A
Solution :
\[I{{F}_{5}}\]is square pyramid (\[s{{p}^{3}}{{d}^{2}}-\]hybridization in I);\[PC{{l}_{5}}\]is trigonal bipyramid (\[s{{p}^{3}}\,d-\]hybridization in P).
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