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# Which one of the following structures is expected to have three bond pairs and one lone pair?

$\begin{array}{1 1}(a)\;\text{Tetrahedral}& (b)\;\text{Trigonal planar} \\(c)\;\text{Trigonal bipyramidal}&(d)\;\text{Pyramidal}\end{array}$

As total number of electron pairs are four (3B.P+1L.P),$\therefore$ it exhibits $SP^3$ hybrid state,but due to the presence of one lone pair of electrons it has pyramidal geometry instead of tetrahedral structure.
Hence (d) is the correct answer.