Write a balanced chemical equation for the reaction that is...

Write a balanced chemical equation for the reaction that is described and then classify the reaction as a substitution, an elimination, an addition, or a rearrangement reaction. (a) 3,3 -dimethylbut-1-ene reacts in acid solution to yield 2,3-dimethylbut-2-ene. (b) 1 -iodo-2,2-dimethylpropane reacts with water to produce, 2,2 -dimethylpropan- $1-$ ol, and $\mathrm{HI}(\text { aq })$. (c) 2 -chloro- 2 -methylpropane reacts with $\mathrm{NaOH}(\mathrm{aq})$ to give 2 -methylprop-1-ene, sodium chloride, and water.

Write a balanced chemical equation for the reaction that is described and then classify the reaction as
a substitution, an elimination, an addition, or a rearrangement reaction.
(a) 3,3 -dimethylbut-1-ene reacts in acid solution to yield 2,3-dimethylbut-2-ene.
(b) 1 -iodo-2,2-dimethylpropane reacts with water to produce, 2,2 -dimethylpropan- $1-$ ol, and $\mathrm{HI}(\text { aq })$.
(c) 2 -chloro- 2 -methylpropane reacts with $\mathrm{NaOH}(\mathrm{aq})$ to give 2 -methylprop-1-ene, sodium chloride, and water.

Key Concepts

Rearrangement Reactions

Rearrangement reactions involve the structural reorganization of a molecule where the connectivity of atoms is changed to form an isomer. This can include shifts of alkyl groups, hydrogen atoms or other substituents, and are common in carbocation intermediates during reactions in organic synthesis.

Elimination Reactions

Elimination reactions are processes in which elements of a molecule are removed to form a double bond, typically resulting in the formation of alkenes or alkynes. They usually involve the removal of a leaving group and a hydrogen atom from adjacent carbons, and can proceed through mechanisms like E1 (unimolecular elimination) or E2 (bimolecular elimination).

Substitution Reactions

Substitution reactions involve the replacement of one atom or functional group in a molecule with another atom or group. This type of reaction is common in organic chemistry, and can occur through mechanisms such as nucleophilic substitution where a nucleophile replaces a leaving group, or electrophilic substitution which often occurs in aromatic systems.

Reaction Mechanisms

Understanding reaction mechanisms involves analyzing the step-by-step sequence of elementary reactions by which overall chemical change occurs. This includes identifying the type of reaction—whether it is substitution, elimination, addition, or rearrangement—and the intermediate species that form, which is essential for predicting product distributions and reaction conditions.

Balanced Chemical Equations

A balanced chemical equation represents a chemical reaction where the number of atoms of each element is conserved from reactants to products. This concept ensures that matter is neither created nor destroyed during the reaction, and it is fundamental to stoichiometry in chemistry, allowing for the proper scaling of reactants and products in any chemical transformation.

Addition Reactions

Addition reactions are characterized by the direct combination of two or more molecules to form a single product, often involving the breaking of a double or triple bond. In organic chemistry, these reactions typically occur in alkenes and alkynes, where reagents add across the unsaturated bonds, frequently under the influence of acids, bases, or catalysts.

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