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  4. In vinyl acetylene CH ≡ C - CH = CH 2, type of overlapping in ( C 2 σ C 3) bond is

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Q. In vinyl acetylene $CH \equiv C - CH = CH _2$, type of overlapping in $\left( C _2 \sigma C _3\right)$ bond is

Chemical Bonding and Molecular Structure

Solution:

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When $(C=C)$ bond and $(C \equiv C)$ bond are present, numbering is done from $(C=C)$ side. Thus, $\left( C _2 \underline{\sigma} C _3\right)$ is formed by $\left(s p^2-s p\right)$ overlapping