Indicate the principal product(s) you would expect in (a) treating CH3 CH2 CH=CH2 with dilute H2

step 1 We're asked to determine the products and the following reactions. The first one is butene with

Indicate the principal product(s) you would expect in (a)...

Indicate the principal product(s) you would expect in (a) treating $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}$ with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq})$ (b) exposing a mixture of chlorine and propane gases to ultraviolet light; (c) heating a mixture of isopropyl alcohol and benzoic acid; (d) oxidizing sec-butyl alcohol with $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ in acidic solution.

Key Concepts

Electrophilic Addition to Alkenes

This concept involves the reaction of alkenes with electrophiles, such as proton donors, resulting in the addition of atoms across the double bond. In aqueous acid conditions, water acts as the nucleophile, and the reaction typically proceeds via a carbocation intermediate where regioselectivity, often according to Markovnikov's rule, directs the formation of the more stable carbocation before water adds, ultimately yielding an alcohol.

Free Radical Halogenation

Free radical halogenation refers to the process in which halogens react with alkanes under conditions that initiate radical formation, such as ultraviolet light. The mechanism involves the homolytic cleavage of the halogen molecule into radicals followed by chain propagation steps where hydrogen atoms are abstracted from the alkane. This results in the formation of various haloalkanes, with the distribution of products influenced by the stability of the intermediate radicals and the number of hydrogen atoms available at different positions.

Fischer Esterification

Fischer esterification is an acid-catalyzed process in which a carboxylic acid reacts with an alcohol, producing an ester and water. The mechanism involves protonation of the carbonyl oxygen, nucleophilic attack by the alcohol, formation of a tetrahedral intermediate, and subsequent elimination of water with reformation of the carbonyl group, yielding the ester product. Heating is typically used to drive the equilibrium toward ester formation.

Oxidation of Alcohols

The oxidation of alcohols by strong oxidizing agents, such as dichromate ions in acidic solution, is a key transformation in organic chemistry. The reaction mechanism depends on the type of alcohol: primary alcohols are generally oxidized to aldehydes or carboxylic acids (under more vigorous conditions), while secondary alcohols are oxidized to ketones. The process involves the removal of hydrogen atoms and the transfer of electrons, reflecting the change in oxidation state of the carbon atom bonded to the hydroxyl group.

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