Now real question 1) I need answer to problem 1 plz Part II: Each Combined Spect

Question

Now real question 1) I need answer to problem 1 plz Part II: Each Combined Spectra Problem on the following pages contains some combination of this information: IR spectrum, mass spectrum or molecular ion peak, major UV peak, lement % mass. On each spectrum, neatly label the major absorption peaks with the structural fragment that causes the absorption. On the answer sheet that follows each problem, fill in the requested information so that you assemble all the structural information that can be obtained from the spectra. Then, using this information, propose the structure and identity of the compound. A logical analysis of the data to support the identification should be written in the "Combined Analysis" section. You can confirm the identity from literature or A completed example is given. section. You can confirm the identity from literature or on-line sources.

Explanation / Answer

Mass spectrum analysis : The intergral molecular weight of the compund is 106. Because it is even number the compound contain either no nitrogen or even nitrogen. the m/z peaks do not show the presence of chloride or bromide.

As well as m/z 91 peak is interesting since it is belongs to tropylium cation i.e any dimethyl benzene loses its one methyl group and converted to a seven membered compound, tropylium cation

Elemental analysis: no data

UV data ; no information provided

Ir data: 1) Aromatic Ring strech absorptions at 1500-1600cm-1

2) =C-H out plane bending 900-500cm-1

3) =C-H-strech for sp2 C-H is 3000-3050cm-1

4) A set of three peaks in 900-500cm-1 indicates meta substitution on aromatic ring

Combined data: 1) The molecular weight 106

2) Aromatic ring absorption are identified in 500-900cm-1 as well as observation of three peaks

3) methyl groups are indicated by a peak of 3000cm-1

the unknown identified as C8H10 or meta Xylene or dimethyl benzene

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