Question

Which of the following molecules exhibit a pure rotational spectrum?

a)

NH3

N2

C60 (Buckminsterfullerene)

C9H10O2N (Phenylalanine)

C2H2 (Acetylene)

b)

HCN

CHCL₃

CH₄

H₂O

CO₂

H₂CO

None

Answer 1

Only those molecules which will have permanent dipole moment shows pure rotational spectra

PART A

NH₃ : Polar Molecule

N2 : Non Polar

C60 (Buckminsterfullerene) : Non Polar

C9H10O2N (Phenylalanine) : Polar

C2H2 (Acetylene) : Non Polar

so polar molecule possess permanent dipole moment so only NH3 and C9H10O2N (Phenylalanine) will show rotational spectrum

PART B

HCN : Polar

CHCL_{3 : Polar}

CH_{4 : Non POlar}

H₂O : Polar

CO_{2 : Non Polar}

H₂CO : Polar

so HCN , CHCL_{3 ,} H₂O , H₂CO will exhibit rotational spectrum

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