Which of the following is not true?
a) The sp3 hybrid orbitals are degenerate.
b) An sp3 hybrid orbital may hold a lone pair of electrons.
c) An sp3 hybrid orbital may form a sigma bond by overlap with an orbital on another atom.
d) An sp3 hybrid orbital may form a pi bond by overlap with an orbital on another atom.
I did google the question, I only ask the question on here to double check.
I get a lot of conflictory answers on Google.
a is not true. Hybrid orbitals are not degenerate whereas atomic orbitals are degenerate. For example, the 3 2p orbitals or the 5 3d orbitals are degenerate. Check out the other three answers. You could Google the questions.
The statement that is not true is:
d) An sp3 hybrid orbital may form a pi bond by overlap with an orbital on another atom.
Explanation:
An sp3 hybrid orbital cannot form a pi bond by overlap with an orbital on another atom. Pi bonds are formed by the overlap of parallel p orbitals, not sp3 hybrid orbitals. Sp3 hybrid orbitals can only form sigma bonds by overlapping with another orbital on another atom.
To determine which statement is not true, we need to examine each option.
a) The statement that sp3 hybrid orbitals are degenerate is true. This means that all sp3 hybrid orbitals have the same energy level.
b) The statement that an sp3 hybrid orbital may hold a lone pair of electrons is also true. In a molecule, the lone pairs of electrons can occupy the hybrid orbitals, including sp3 hybrid orbitals.
c) The statement that an sp3 hybrid orbital may form a sigma bond by overlap with an orbital on another atom is true. Sigma bonds are formed by the head-on overlap of orbitals.
d) The statement that an sp3 hybrid orbital may form a pi bond by overlap with an orbital on another atom is not true. Pi bonds are formed by the sideways overlap of orbitals, specifically p orbitals.
Therefore, the answer is d) An sp3 hybrid orbital may form a pi bond by overlap with an orbital on another atom.