Type of bonds between calcium and carbon in CaC2 are:
Cis-dicholoroethylene can be converted to trans-dichloroethylene by irradiation. During the interconversion (A) both the π and σ bonds are broken and reformed. (B) only the π bond is broken and reformed. (C) the C-Cl and C-H bonds are broken, H and Cl atoms interchange their positions and new bonds are formed. (D) both the π and σ bonds rotate along with the groups.