Chapter 8, Problem 128A

Interpretation Introduction

Interpretation:

The bond polarity needs to be arranged from least to greatest in the given bonds:

Concept introduction:

In covalent compounds, atoms are bonded with covalent bonds which are formed by equal sharing of electrons. The polar and non-polar covalent compounds can be classified on the basis of polarity of chemical bonds present in the molecule. The non-polar compounds have same electro negativity of bonded atoms whereas polar covalent are composed of those bonded atoms which have significant difference in their electro negativity.

The more electronegative atom gets partial negative charge whereas less electronegative atom gets partial positive charge.

Answer to Problem 128A

$\text{C-Br < C-Cl <C-O }<\text{ Si-O < Ge-O }$

Explanation of Solution

As the electro negativity difference between bonded atoms increases, the bond polarity also increases. Thus the bond between most electropositive and most electronegative atom must be most polar. In the given atoms, O is most electronegative element whereas Ge is the least electronegative element. Hence the order of polarity can be written as:

$\text{C-Br < C-Cl <C-O }<\text{ Si-O < Ge-O }$

Conclusion

Thus, the bond polarity depends on the electro negativities of bonded atoms.