The two carbon atoms in acetylene are

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(C) Acetylene $(C_2H_2)$ contains a carbon-carbon triple bond. In the structure $H-C \equiv C-H$,each carbon atom is bonded to one hydrogen atom and o

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$sp$ hybridized

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(C) Acetylene $(C_2H_2)$ contains a carbon-carbon triple bond. In the structure $H-C \equiv C-H$,each carbon atom is bonded to one hydrogen atom and one carbon atom via a triple bond. According to the valence bond theory,each carbon atom undergoes $sp$ hybridization by mixing one $2s$ and one $2p$ orbital. These two $sp$ hybrid orbitals are oriented at an angle of $180^{\circ}$ to each other,resulting in a linear geometry.

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Reason : $sp$ hybridised carbon atoms of acetylene are considerably electronegative.

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