Which of the following statements regarding Be is /are true? (I) It forms covalent compounds almost exclusivlty , evan with the highly eletronegative elements (II) It does not form ionic compounds containing simple `Ber^(+)` ion , but does readily acheve a maximum coordination mumberof fopur through formation of complex ions such as and `BeF_(4)^(2-)[Be(H_(2)))_(4)]^(2+)`. (III) it forms a series of organo derivatives `BeR_(2)` and `[BeR_(3)]`,which contain covalent Be-C bonds. (IV) Its halides are covalent polymers that are readilty hyrolysed or cleaved by donors.A. All are correctB. I,ii & iv onlyC. I,iii &iv onlyD. I,ii,&iii only

Which of the following statements regarding Be is /are true? (I) It fo

1.	Which of the following statements regarding Be is /are true? (I) It forms covalent compounds almost exclusivlty , evan with the highly eletronegative elements (II) It does not form ionic compounds containing simple `Ber^(+)` ion , but does readily acheve a maximum coordination mumberof fopur through formation of complex ions such as and `BeF_(4)^(2-)[Be(H_(2)))_(4)]^(2+)`. (III) it forms a series of organo derivatives `BeR_(2)` and `[BeR_(3)]`,which contain covalent Be-C bonds. (IV) Its halides are covalent polymers that are readilty hyrolysed or cleaved by donors.A. All are correctB. I,ii & iv onlyC. I,iii &iv onlyD. I,ii,&iii only
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