Plane

The nodal plane in the pi -bond of ethene is located in: The molecular plane, A plane parallel to the molecular plane, A plane perpendicular to the molecular plane which bisects the (C-C) σ -bond at a right angle, A plane perpendicular to the molecular plane which contains the (C-C) σ -bond

A variable plane passes through a fixed point(3,2,1) and meets and axes at A,B,C respectively. A plane is drawn parallel to plane through a second plane is drawn parallel to plane through A,B,C . Then the locus of the point of intersection of these three planes, is :