In which of the following, the pi bond is present in the bonding structure of the compound. I. Alkane II. Alkene III. Alkyne
A
I only
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B
III only
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C
I and III only
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D
II and III only
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E
I, II and III
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Solution
The correct option is D II and III only In II. Alkene and III. Alkyne, the pi bond is present in the bonding structure of the compound. II. Alkene contains C=C double bond with one sigma bond and one pi bond. III. Alkyne contains C≡C triple bond with one sigma bond and two pi bonds. I. Alkane contains only sigma bond.