Which of the following are not polymeric

Which of the following exists in polymeric form

Which of the following exists in polymeric form? AlCl_3 , BeCl_2 , SiC , B_2 H_6

In which of the following linear polymeric biomolecule, the two ends are described as 'reducing and non-reducing ends?

Which of the following exists as polymeric chain in the solid state?

Which of the following exists as polymeric (covalent) solid at room temperature with coodination number '6' for the central atom?

Which of the following is a copolymer formed by condensation polymerization?