Doubt from Thermodynamics

Ans is C?

Is it B ?

Please give the solution

Answer is option C

Total number of DOF is given by formula 3N where n is no of atom.

acetylene(N=4) is linear so it will have 2 rotational and 3 translation DOF(apply for all linear molecule having N>1) and rest 7 are vibrational total =3*4=12

Now 3R/2+2R/2+7R= 19R/2

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