Dear sarthak mitra,
Conjugated alkenes are alkenes that have alternate single & double bonds between the carbon atoms of the molecule in its entire structure .
For example, 2-Butene has alternate single and double bonds between the carbon atoms in it .

This is an example of conjugated alkenes .
Hope this helped you immensely...
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Regards,
AskIITians Expert,
Godfrey Classic Prince
IIT-Madras
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