Number and type of bonds between two carbon atoms in ${CaC}_{2}$ are ;

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one $σ$ and one and a half $π$ bond

one $σ$ bond

one $σ$ and two $π$ bonds

one sigma $σ$ and one Pi ( $π$ ) bond

answer is B.

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Detailed Solution

Number and type of bonds between two carbon atoms in ${CaC}_{2}$ are one $σ$ and two $π$ bonds.

A single bond between two atoms is always considered as sigma bond.
A double bond between two atoms is always considered as one sigma and one pi bond
A triple bond between two atoms is always considered as one sigma bond and two pi bonds.
So according to the given structure ${CaC}_{2}$ (Calcium carbide) ha 1 sigma and 2 pi bonds.

Hence, the option B is correct.

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