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Which of the following possesses only sp hydridized carbonds?

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Which of the following possesses only sp hydridized carbonds?
A. Butyne
B. Buta-1,2-diene
C. Buta-1,3-diyne
D. Propadiene
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Correct Answer - C
Four sigma bonds `(sp^3)` 3 sigma bonds and one pi bond `(sp^2)` 2 sigma bonds and 2 pi bonds (sp):
`underset((1))(overset(sp^2)(C)H_2=overset(sp^2)(C)H-overset(sp)(C)-=overset(sp)(C)H)`
`underset((2))(overset(sp^2)(C)H_2=overset(sp)(C)=overset(sp^2)(C)H-overset(sp^3)(C)H_3)`
`underset((3))(overset(sp)HC-=overset(sp)(C)-overset(sp)(C)-=overset(sp)(C)H)`
`underset((4))(overset(sp^2)(C)H_2=overset(sp)(C)=overset(sp^2)(C)H_2)`
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