1. A Review of General Chemistry

In a molecule of cumulene with the formula $C_4{H}_4$, how many sigma ($\sigma$) and pi ($\pi$) bonds are present?

In the structure of ethene ($C_2{H}_4$), how many sigma ($\sigma$) bonds are present?

Consider the molecule ethene ($C_2{H}_4$). How many sigma and pi bonds are present in this molecule?

Which statement is correct regarding a $\pi$ bond?

In a double bond, which type of bond is formed by the overlap of $p$ orbitals?

Which type of bond is formed by the sideways overlap of $p$ orbitals in the conjugated portion of a molecule?