Chapter 5, Problem 52P

Interpretation Introduction

Interpretation:

Number of $\Pi$ bonds in the given organic compound has to be determined.

Concept introduction:

• Molecular formula is a chemical formula that shows the total number of kinds of atoms in a molecule.  Some types of organic compounds and their general formulas listed below,

  $\begin{array}{cc}Organiccompound& Genaralformula\\ Alkane& C_n{H}_{2n+2}\\ Alkene& C_n{H}_{2n}\\ Alkyne& C_n{H}_{2n-2}\end{array}$

• In the formula of organic compound two hydrogen atom should be subtracted from its general formula if the compound contains $\Pi$ bond or ring.
• Degree of unsaturation of an organic compound can be determined by using the equation,

$\begin{array}{c}\frac{\left(2n+2-X\right)}{2}\\ n=numberofcarboninthemolecule\\ X=numberofhydrogenatominthemolecule\end{array}$

• The number of $\Pi$ bonds can be calculated using the above equation also.  Because the presence of $\Pi$ bonds make the compound unsaturated.