Question

The element that shows greater ability to form $p\pi -p\pi$ multiple bonds, is

• A. Si
• B. Ge
• C. Sn
• D. C

Answer 1

The correct option is D C

If the orbital is very large, there will not be any effective overlapping between the orbitals to form the pi bond and the bond will not be able to be stabilized. So the orbitals with bigger size cannot form the pπ−pπ multiple bonds.

In the given options, we see that all the elements belong to the same group. We know the size increases down the group and so will the orbital size.
Carbon is the smallest of all and so it will have the highest tendency to form pπ−pπ multiple bonds.

Carbon atom has 2p orbitals which able to form strongest $p\pi -p\pi$ bonds due to its size.

Hence, option (d) is correct.