Methylene Chloride, CH₂Cl₂ (Normal Mode 9)

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

a small amount of motion is associated with the C atom

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

the stretching of the two C-H bonds is symmetric (i.e., the displacements of the C and H
atoms are equal for both C-H bonds)

symmetric stretching is a type of stretching motion