Instructions: Write the structure of each molecular formula using the IR and Mass Spec spectra. Important...

Question

Question

Answer 1

Answer #1

C₉H₁₂

major IR peaks

2865 cm^-1 corresponds to C-C stretch

3027 and 3062 lies in aromatic and C=C region

1455 cm^-1 corresponds to CH₃ bending

in molecular formula the no. of carbon and hydrogens are not in straight alkene form but it is aromatic .

mass spectrum shows the fragments of 120 as molecular ion peak , at 29 m/z peak of ethyl ion, 105 m/z 1-ethyl benzyl cation

the compound is 1-ethyl-2-methylbenzene or 2 -ethyl toluene.

C₇H₁₃Br

major IR peaks

2938 and 2849 cm^-1 sharp

these peaks correspond to aliphatic C-H stretching

no peak suggest it having an alkene or aromatic ring

1445 cm^-1 medium corresponds to CH₂ bending

Mass Spectroscopic data

Molecular weight of C₃H₁₃Br = 176

no. of Carbons and Hydrogens in above aliphatic compound fit only when it is cyclic seven membered ring with onr Br substituent.

Answer 2

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