Which of the following is not different for two atoms in N-Cl bond

Which of the following is the property of bonded atom ?

Which of the following has shortest C-Cl bond?

Which of the following species contains two lone pairs ant two bond pairs around the central atom ?

Which of the following atoms do not usually form bonds?

IF z-axis is the bond forming axis, then which of the following type of overlap cannot form pi -bond [orbitals given are of two different atoms]?

Which of the following consists of two or more than two different types of atoms?