Which of the following group elements exhibits high melting and boiling points

Which of the following of group 14 has the highest melting and boiling point ?

Which compounds exhibit high melting and boiling points?

d-block elements have high melting and boiling points. Why?

Which of the following non metals has high melting and boiling point

Explain the following : (a) Boron has high melting and boiling points.

In which of the following group of periodic table melting and boiling point increase as we go down the group?