Which among the following elements of 3nd  period shows maximum tendency of forming dπ−pπ bond ?ChlorineSiliconPhosphorusSulphur

The element with the maximum tendency of forming dπ−pπ bonds among the given options is Sulphur.

Here's the step by step explanation:

1. dπ−pπ bonds are formed between two atoms when one of the atoms has vacant d orbitals.

2. In the 3rd period of the periodic table, only Sulphur and Phosphorus have vacant d orbitals.

3. However, Sulphur shows a greater tendency to form dπ−pπ bonds because it can expand its octet and accommodate more electrons in its vacant d orbitals.

4. Therefore, among Chlorine, Silicon, Phosphorus, and Sulphur, Sulphur shows the maximum tendency of forming dπ−pπ bonds.