4.18. Explain with the help of suitable example polar covalent bond.

<p><strong>4.18. </strong>When two dissimilar atoms having different electronegativities combine to form a covalent bond, the bond pair of electrons is not shared equally. The bond pair shifts towards the nucleus of the atom having greater electronegativity. As a result, electron distribution gets distorted and the electron cloud is displaced towards the electronegative atom.</p><p>As a result, the electronegative atom becomes slightly negatively charged while the other atom becomes slightly positively charged. Thus, opposite poles are developed in the molecule and this type of a bond is called a polar covalent bond.</p><p>For example, in hydrogen fluoride molecule (HF), flouride has greater electronegativity than hydrogen. Thus, the shared electron pair is displaced more towards flourine atom; the later will acquire a partial negative charge (? ^–). At the same time hydrogen atom will have a partial positive charge (? ⁺). Such a covalent bond is known as polar covalent bond or simply polar bond.<br>It is represented as</p><p><picture><img src="https://images.shiksha.com/mediadata/images/articles/1741770481phpVoaT3d.jpeg" alt="" width="135" height="103"></picture></p>

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