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Question

Which of the following molecule has a double bond?

A
H2
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B
F2
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C
Cl2
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D
O2
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Solution

The correct option is C O2
The electronic configuration of hydrogen is 1s1
Diatomic molecule of hydrogen (H2) is formed by s-s overlap leads to one σbond.
(b) The electronic configuration of fluorine is 1s22s22p5
Diatomic molecule of fluorine (F2) is formed by p - p overlap leads to one σbond.
(c) The electronic configuration of Chlorine is 1s22s22p63s23p5. Diatomic molecule of chlorine (Cl2) is formed bu p - p overlap leads to one σbond.
(d) The electronic configuration of oxygen is 1s22s22p4.
Diatomic molecule of oxygen (O2) is formed by one pzpz overlap leads to one σbond and side on overlap of pypy leads to πbond.
So, O2 contains a double bond.

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