Question

Diazene N2H2 (also known as diimine), is commonly used as a reagent for organic syntheses. Label each picture with the type of bond in diazene that it describes.

Answer 1

Concepts and reason

The chemical bond is formed by the attraction of atom or ions. Due to electronegativity, the atoms can attract the electrons in a chemical bond. The chemical bonding is formed with the help of overlapping of the atomic orbitals.

There are two types of bond. They are sigma bond $\left( \sigma \right)$ and pi bond $\left( {\rm{\pi }} \right)$ .

Fundamentals

Sigma bond:

The head – on overlapping of atomic orbitals leading to a covalent bond formation is represented as sigma bond.

Pi bond:

A side wise overlapping of atomic orbitals leading to the formation of covalent bond is represented as pi bond.

Example:

The double bond in ethene contains 1 sigma bond and 1 pi bond. The 4 valence electrons of each carbon forms a bond with 2 hydrogen atom, 1 carbon – carbon sigma bond and 1carbon – carbon pi bond.

The double bond in ethene includes 1 ${\rm{\sigma }}\,{\rm{(s}}{{\rm{p}}^{\rm{2}}}{\rm{ - s}}{{\rm{p}}^{\rm{2}}}{\rm{ overlap)}}$ and 1 ${\rm{\pi }}\,{\rm{(p}}\,{\rm{ - }}\,{\rm{p overlap)}}$ bonds and each carbon – hydrogen bond shows ${\rm{\sigma }}\,{\rm{(s}}{{\rm{p}}^{\rm{2}}}{\rm{ - s overlap)}}$ .The bond angle is 120⁰ and it shows the trigonal planar geometry.

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