Which of the following about covalent bonding are true? 1.There is free rotation around a pi...

Which of the following about covalent bonding are true?

1.There is free rotation around a pi bond

2.There is free rotation around a sigma bond

3. The electron density in a pi bond is concentrated along the bond axis between atoms in the bond

4. Atoms that are connected by only a sigma bond are further apart and are connected by both a sigma and pi bond

Expert Solution

Ans: (4)

A covalent bond is a chemical bondthat involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs orbonding pairs and the stable balance of attractive and repulsive forces between atoms when they share electrons is known as covalent bonding.

Covalent bonding includes many kinds of interactions, including σ-bonding, π-bonding, metal-to-metal bonding, agostic interactions, bent bonds, and three-center two-electron bonds.

Atomic orbitals (except for s orbitals) have specific directional properties leading to different types of covalent bonds. Sigma bonds (σ bonds) are the strongest covalent bonds and are due to head-on overlapping of orbitals on two different atoms. A single bond is usually a sigma bond. Pi bonds are weaker and are due to lateral overlap between p (or d) orbitals. A double bond between two given atoms consists of one sigma and one pi bond, and a triple bond is one sigma and two pi bonds.

queen_honey_blossom answered 1 year ago

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