(a) he reagent(s) type yo Choose the reagents from the ones shown below (A-L). E للہ علہلہ پہلا میں مللی پھیلہ میر رہی ہلو بلی میر بلد Br F prepare Tollowing target Br Br C G K
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- (a) Draw two different enol tautomers of 2-methylcyclohexanone. (b) Draw two constitutional isomers that are not tautomers, but contain a C=C and an OH group. 2-methylcyclohexanonePlease give the main substitution product for each of the following reactions, and indicate the dominant mechanism: (a) 1-bromopropane + NaOCH3 → (b) 3-bromo-3-methylpentane + NaOC2H5 →Electrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict themajor products of the reactions of naphthalene with the following reagents.(a) HNO3, H2SO4
- 1) Provide the reagent(s) and the reaction mechanism of the following reaction. H₂Nb) Listed below are several hypothetical nucleophilic substitution reactions. None is synthetically useful because the product indicated is not formed at an appreciable rate. In each case provide an explanation for the failure of the reaction to take place as indicated. OMe HO + OMe + OH HO + CH; OHWhich of the following reactions will synthesize phenol from benzene? 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) warm H2SO4 and H2O 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) CuCN; 5) dilute acid and heat 1) Acetyl chloride & AlCl3; 2) bleach 1) Ph-N2+ + KI; 2) BrMgCH=CH2 in ether, followed by H3O+; 3) warm, conc'd KMnO4 1) Cl-CH(CH3)-CH2CH2CH3 + FeBr3; 2) hot, conc'd KMnO4
- When propenal is treated with sodium acetylide, a product is formed whose IR spectrum exhibits a broad absorption between 3200 and 3600 cm¯1, but shows no absorption near 1700 cm-1. (a) Draw the structure of the product. (b) Argue whether the nucleophile adds reversibly or irreversibly to the carbonyl group. CH HC || CH2 1. HC=CNa ? 2. NH,CI(b) Answer the following questions based on the compounds below. Jawab soalan berikut berdasarkan kepada sebatian di bawah. CI CI A в (i) Which compound has the higher boiling point? Explain. Sebatian manakah mempunyai takat didih yang lebih tinggi? Terangkan. (ii) Draw the SN2 mechanism for the reaction of compound A with sodium hydroxide, NaOH. Lukis mekanisma Sn2 bagi tindak balas antara sebatian A dengan natrium hidroksida, NaOH.Explain why methyl trifluoroacetate, CF3CO2CH3, is more reactive than methyl acetate, CH3CO2CH3, in nucleophilic acyl substitution reactions.
- Illustrate the resonance effect of the methoxy group -OCH3, on the structure of the benzene ring. Draw all the oissuvke resonance forms of methoxybenzene, including the hybrid Based on the structures, explain how the presence of the -OCH3 group affects: (i) the reactivity of the benzene ring towards electrophilic attack (ii) the orientation or point of attack of an incoming electrophilic reagent on the benzene ring.(b) Answer the following questions based on the compounds below. Jawab soalan berikut berdasarkan kepada sebatian di bawah. Br -Br A в (i) Which compound has the lower boiling point? Explain your answer. Sebatian manakah yang mempunyai takat didih yang lebih rendah? Terangkan jawapan anda. (ii) Draw the SN1 mechanism for the reaction of compound B with sodium hydroxide, NaOH. Lukiskan mekanisma SN1 bagi tindak balas antara sebatian B dengan natrium hidroksida, NaOH. (ii) Arrange the following compounds in increasing order of acidity. Susunkan sebatian berikut mengikut tertib menaik keasidannya. он HO, HO, EFollowing is a balanced equation for bromination of toluene.(a) Using the values for bond dissociation enthalpies given in Appendix 3,calculate ∆H0for this reaction.(b) Propose a pair of chain propagation steps and show that they add up to theobserved reaction.(c) Calculate ∆H0for each chain propagation step.(d) Which propagation step is rate-determinin