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Transcription of this question: The structure of an organic molecule can help predict the type of reaction it can undergo.(a) The Kekulé structure of benzene suggests it should readily undergo addition reactions.Discuss two pieces of evidence, one physical and one chemical, which suggest this isnot the structure of benzene.Physical evidence:Chemical evidence:[2]0)Aldehyde:Formulate the ionic equation for the oxidation of propan-l-ol to the correspondingaldehyde by acidified dichromate(Vl) ions. Use section 24 of the data booklet.The aldehyde can be further oxidized to a carboxylic acid.Outline how the experimental procedures differ for the synthesis of the aldehydeand the carboxylic acid.[2][2]Carboxylic acid:(c)Improvements in instrumentation have made identification of organic compoundsroutine.The empirical formula of an unknown compound containing a phenyl group was foundto be C4H,O. The molecular ion peak in its mass spectrum appears at mlz 136.(i) Deduce the molecular formula of the compound.Identify the bonds causing peaks A and B in the IR spectrum of the unknowncompound using section 26 of the data booklet.80c 604020350030002500 200015001000Wavenumber / cm-l[Source: and Agriculture Organization Of the LJnited Nations, http•’user_upIoad/jecfafimgJ851_gif_B:(iii)Reproduced With permission]Deduce full structural formulas of two possible isomers of the unknowncompound, both of which are esters.[2](iv)Deduce the formula of the unknown compound based on its iH NMR spectrumusing section 27 of the data booklet.1110987654Chemical shift / ppm32[Source: soas, National Institute Of Advanced Industrial Science and Technology_l

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