Question

Which of the following orbitals can undergo hybridisation?

• A. $3pand4s$
• B. $3sand4s$
• C. $2pand4d$
• D. $3sand3d$

Answer 1

The correct option is D $3sand3d$

Atomic orbitals which have the same or similar energy will undergo hybridisation. From the given options, $3sand3d$ have similar energy. All the other options have different energy levels as the principal quantum number is different. Thus, only 3s and 3d orbitals undergo hybridisation.