The elements A,B,C and D belong to group...

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

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The correct Answer is:

C and D

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