The elements A, B, C and D belong to groups 1, 2,14 and 17 respectively of the periodic table.
The elements A, B, C and D belong to groups 1, 2,14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond ?
(i) A and D
(ii)C and D
(iii) Aand B
(iv)B and C
(v) Aand C
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