Question

Write equations for the following: (a) an addition reaction between${\mathbf{H}}_{\mathbf{2}}\mathbf{O}$ and 3-hexene (${\mathbf{H}}^{\mathbf{+}}$ is a catalyst); (b) an elimination reaction between 2-bromopropane and hot potassium ethoxide, ${\mathbf{CH}}_{\mathbf{3}}\mathbf{-}{\mathbf{CH}}_{\mathbf{2}} \mathbf{-}\mathbf{OK}$( KBr and ethanol are also products); (c) a light-induced substitution reaction between and ethane to form 1,2-dichloroethane.

Short answer

The products obtained from the reaction a) hexane-2-ol b) propene c) 1,2-dichloroethane.

Step-by-step solution

Introduction

Since the given compounds are organic compounds, the reactions are organic. Organic reactions can be of many types like addition reactions, elimination reactions, substitution reactions, photochemical reactions, pericyclic reactions, and rearrangement reactions.

An addition reaction between H2Oand 3-hexene ( H+ is a catalyst)

Addition reactions are the addition of a reagent occurring and a pi bond is broken to generate two new sigma bonds. Since 3-hexene is a symmetric alkene, the addition of water occurs to give 3-hexanol.

Step 3: an elimination reaction between 2-bromopropane and hot potassium ethoxide, CH3-CH2 -OK ( KBr and ethanol are also products)

An elimination reaction is a reaction in which two substituents are removed from the molecule or substrate in one or two steps. If the elimination is a one-step process it is known as E2 elimination while, if it is a two-step process, it is known as E1 elimination. The main product formed as a result of this elimination reaction is propene. The reaction can be represented as-

Step 4: light-induced substitution reaction between  Cl2 and ethane

In a Light-induced substitution reaction ( a photochemical reaction), replaceable atoms of the substrate molecule are substituted by a reagent in presence of light. These reactions proceed by free radical mechanisms. The reaction given can be represented as-