Statement 1 : The double bond in C2 molecule consists of both π−bonds.Statement 2 : Four electrons are present in two π−bonding  molecular orbitals in C2.

Both are true statements C2:  σ1s2 σ*1s2σ2s2 σ*2s2 π2px2=π2py2 or  KKσ2s2 σ*2s2 π2px2=π2py2The bond order of C2  is  1/28−4=2  and  C2 should be diamagnetic. It is important to note that double bond in C2 consists of both pi bonds because of the presence of four electrons in two pi molecular orbitals. In most of the other molecules a double bond is made up of a sigma bond and a pi bond.