Predict the major product when a hydrogen halide or water adds to an unsymmetrical alkene, explaining that the reaction goes through the more stable carbocation (tertiary over secondary over primary) stabilized by the inductive effect of alkyl groups.
Tę umiejętność sprawdza 13 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Which statements about the reaction of hydrogen bromide with 2-methylpropene are correct? I. A tertiary carbocation is formed as an intermediate. II. The major product is a primary halogenoalkane. III. The first step of the mechanism is attack of an…
Which compound is the major product when 2-methylpropene, (CH3)2C=CH2, reacts with hydrogen chloride, HCl? A. (CH3)3CCl B. (CH3)2CHCH2Cl C. CH3CHClCH2CH3 D. (CH3)2CClCH2Cl
(i) Iodine molecules, I2, undergo homolytic fission when they absorb light. Write an equation for this process, using curly arrows to show the movement of the electrons. (ii) In the presence of a suitable reagent the I–I bond can instead break…
2-Methylbut-1-ene reacts with hydrogen bromide, HBr, to give two structural isomers of C5H11Br. (i) Deduce which of the two isomers is formed in the larger amount and explain your choice. (ii) Using curly arrows to show the movement of electron pairs,…
Two products are possible in this reaction. (i) Explain the mechanism for the formation of the major product, using curly arrows to show the movement of electron pairs. (ii) Explain why the mechanism results in one product being formed in greater quantity than…
Which of the following pairs of reactants could form the carbocation intermediate shown? I. (CH3)2C=CHCH3 and HBr II. CH3CH2CH(CH3)CH2Br and H2O III. CH3CH2C(CH3)2Br and H2O A. I and II only B. I and III only C. II and…
Butanone can be synthesized from but-1-ene in a two-stage process. In the first stage but-1-ene reacts with water and sulfuric acid to form an intermediate compound X. In the second stage X reacts with reagent B to form butanone. (i) Draw the structural…
Butanone can be synthesised from but-1-ene in a two-stage process. In the first stage the alkene reacts with water in the presence of sulfuric acid to form the intermediate compound [X]; in the second stage [X] is converted into butanone by reagent B. (i) Draw…
Which compound is the major product of the reaction between hydrogen bromide and 2-methylbut-1-ene, CH2=C(CH3)CH2CH3? A. 1-bromo-2-methylbutane B. 2-bromo-3-methylbutane C. 1,2-dibromo-2-methylbutane D. 2-bromo-2-methylbutane
Which compound reacts with HBr to form 2-bromo-2-methylbutane as the major product? A. Pent-2-ene B. 2-Methylbut-2-ene C. Pent-1-ene D. Cyclopentene
Compound B can also be made by the hydration of an alkene. The same reaction also gives a smaller amount of the isomer 3-methylbutan-2-ol, (CH3)2CHCH(OH)CH3. (i) Draw the structural formula of the alkene that is needed. (ii) Explain why the reaction…
(i) Write the equation for the reaction between hex-3-ene and hydrogen bromide. (ii) State the type of reaction in (i). (iii) Suggest two differences between the NMR spectra of hex-3-ene and of the organic product in (i). Use section 21 of the data…
Which sequence of reagents converts but-1-ene into butanone? Each reagent is added to the product of the previous reaction. A. HBr, then NaOH(aq), then acidified K2Cr2O7(aq) B. HBr, then acidified K2Cr2O7(aq), then…
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