If the bond angle between two adjacent hybrid orbitals is 109.5° , the hybridization is sp³ .
When s orbitals combines with three p orbitals (px, py and pz) four sp³ hybrid orbitals with similar characteristics are formed. These hybrid orbitals have a bond angle of 109.5° between them, which causes the minimum electronic repulsion between them.
An atom in which all the atoms that are bonded to it contains single bonds is an sp³ hybridized atom. For example-alkanes.
For, sp³ hybridized central atoms, the molecular geometry is a tetrahedron. But, if the geometry is distorted due to lone pairs then trigonal pyramidal or bent geometry is formed.
Thus, option "c" is correct.
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