In which of the following compound sp^(2)- hybridisation is absent?

1.	In which of the following compound sp^(2)- hybridisation is absent?
Answer» `CH -=C-CH= CH_(2)` `CH -= C-CH_(2)-CH_(3)` `CH_(3)-CH=CH_(2)` `CH_(2)=CH-CH_(2)-C_(3)` Solution :`overset(sp)(C H)= overset(sp)(C )- overset(sp^(3))(C II_(2)) - overset(sp^(3))(CH)_(3)`: In but-1-yne there is no CARBON with `sp^(2)`-hybridization

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