Question

Viberation modes for cH2cl2

Answer 1

Normal vibration is that vibration where all the component atoms oscillate harmonically with the same frequiency and same frequency.A non linear molecule,like methylene dichloride CH₂Cl₂ (C_2v), containing N atoms can have 3N-6 fundamental or normal modes of vibration.Vibrational modes and fundamental frequencies of CH₂Cl₂ are shown below-

Vibrational modes Symmetry Fundamental frequencies(in cm^-1)

₁ C-H symmetric stretching vibration A₁   2997.66

₂ CH2 bending vibration A1 1434.15

₃   CCl symmetric stretching vibration A1 712.9

₄ CCl2 bending vibration A1 281.5

₅ torsional vibration A2 1153 (inactive)

₆ C-H symmetric stretching vibration B1 3055

₇ CH2 rocking vibration    B1 898.66

₈ CH2 wagging vibration B2 1268..86

₉ CCl symmetric stretching vibration B2 759.82