Methylene Chloride, CH₂Cl₂ (Normal Mode 4)

the stretching motion occurs in the plane defined by the C atom and the two Cl atoms

a small amount of motion is associated with the two H atoms

the greater displacement of the C atom compared with the Cl atoms (i.e., the Cl atoms are
much more massive than the C atom)

the stretching of the two C-Cl bonds is asymmetric (i.e., the displacements of the C and Cl
atoms are not equal for both C-Cl bonds)

asymmetric stretching is a type of stretching motion