Question
Explain with the help of suitable example polar covalent bond.
✓
Answer
When two atoms with different electronegativity are linked to each other by covalent bond, the shared electron pair will not in the centre because of the difference in electronegativity. For example, in hydrogen fluoride molecule, fluoride has greater electronegativity than hydrogen. Thus, the shared electron pair is displaced more towards’ fluorine atom, the later will acquire a partial negative charge $(\delta^+)$. At the same time hydrogen atom will have a partial positive charge $(\delta^-)$. Such a covalent bond is known as polar covalent bond or simply polar bond.
It is represented as $\ \ \ \delta^+\ \ \ \ \delta^-\\\ \ \text{H}\ -\ \text{F}\$2.1)\ (4.0)$
It is represented as $\ \ \ \delta^+\ \ \ \ \delta^-\\\ \ \text{H}\ -\ \text{F}\$2.1)\ (4.0)$
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