Which of the following acid exist in polymeric form?

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

Which of the following exists in polymeric form

Which of the following solids is polymeric ?

Which of the following exists in dimeric form _________

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

Which of the following are not polymeric ?