Question

In $C_3^{4-}$, the number of $\sigma$-and $\pi$-bonds present between carbon atoms are:

• A. $1\sigma$ and $1\pi$
• B. $2\sigma$ and $2\pi$
• C. $2\sigma$ and $1\pi$
• D. $1\sigma$ bond only

Answer 1

Answer: (B)

$2\sigma$ and $2\pi$

The middle carbon is the one which is attached to other carbon atoms. Since, it has a valency of $4$, it needs to be attached with $2$ carbons with $4$ bonds. This is possible only when there are $2$ double bonds. This makes it $2$ single bonds and $2$ double bonds.