Electronic Configuration and General Properties — Prelims Questions

Which of the following statements regarding the properties of Group 14 elements is INCORRECT?

Which of the following elements of Group 14 has the highest first ionization enthalpy?

Which of the following statements correctly explains the inert pair effect in Group 14 elements?

Among the Group 14 elements, the tendency to form $p\pi-p\pi$ multiple bonds is strongest for:

Which of the following elements is a metalloid in Group 14?

Which of the following pairs of Group 14 elements shows an irregularity in the expected decreasing trend of first ionization enthalpy?