Mesityl oxide( (CH3)2C=CHCOCH3) shows two bands at 230 nm (12600) and 327 nm (98). But its isomer, ( CH2=C(CH)3-CH2COCH3) does not show any bands above 210 nm. Explain.
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Mesityl oxide( (CH3)2C=CHCOCH3) shows two bands at 230 nm (12600) and 327 nm (98). But its isomer, ( CH2=C(CH)3-CH2COCH3) does not show any bands above 210 nm. Explain.
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- Account for the CO vibrational frequencies observed in the following metal carbonyl compounds. Compound vco (cm-') Free CO :2143 Ni(CO)4 :1890 cis-Pd(C6F5)2(CO)2: 2186 Explain how and why the degree of metal-alkene back-bonding differs in the compounds K[PtC(CH2=CH2)] and [Pt(CH2=CH2)(PPh3)2]. Compare the reactivity of an alkene bound to a metal centre with that of a free alkene. Give two examples to support your answer.The UV spectrum of acetone shows two peaks of amax = 280 nm, e = 15 and 2max = 190 nm, e = 100. Identify the electronic transition for each. Which is more intense?20) An unknown compound has the chemical formula CH₂O. It's IR spectrum and ¹H NMR spectrum are shown below. Propose a structure for the unknown molecule. Calculate the Degrees of Unsaturation (DU), assign any important peaks in the IR spectrum to vibrational modes and briefly explain why the structure fits the 'H NMR spectrum that is provided Degrees of unsaturation (show work below): 442 Du= (2(3)+2)-6 2 -8-16 - 2²/2/2 = 1 3437 1739 Amply 0 Vibrational Assignments of IR Peaks Wavenumber (cm-¹) Vibrational Assignment 0-4 stretch 6=0 strekh Peak 1: 9.79 ppm 14 Singlet 3 8 Brief rationalization for proposed structure: (explain why DU, IR, and NMR are consistent with proposed structure) ppm Peak 2 2.45 ppm 2H Quartet Peak 3 1.11 ppm 3H Triplet D Proposed structure of unknown:
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- Which parameter between "solvent polarity function" and dielectric constant show better correlation with the peak positions? (cyclohexane, dioxane, acetonitrile, ethanol, ethylene glycol)A certain compound was known to have a formula which could be represented as [NICXH,NZ](CIO4)2. Analysis showed that the compound contained 35.7%C and 6.0%H. When Converted to the corresponding thiocyanate, [NICXHYN=](SCN)2, its analysis showed 47.5%C and 7.1%H. Calculate the values of x,y, and zThe UV spectrum of acetone shows two peaks of lambda max = 280 nm, e=15 and lambda max=190nm, e=100. Identify the electronic transition for each. Which is more intense?