Mastering the reactions of halogenoalkanes requires distinguishing between nucleophilic substitution and elimination based on the reagents used ( ). By understanding the bond polarity (
In these reactions, the nucleophile replaces the halogen atom. A. Reaction with Aqueous Hydroxide (Hydrolysis) Aqueous Potassium Hydroxide ( Conditions: Heat under reflux. Product: Alcohol. Equation: Mechanism: Nucleophilic substitution ( SN2cap S sub cap N 2 SN1cap S sub cap N 1 B. Reaction with Cyanide (Formation of Nitriles) Reagent: Potassium Cyanide ( KCNcap K cap C cap N ) in ethanol/water. Conditions: Heat under reflux. Product: Nitrile (increases the carbon chain length). Equation: C. Reaction with Ammonia (Formation of Amines) Reagent: Alcoholic Ammonia ( NH3cap N cap H sub 3 in ethanol). Conditions: Heat in a sealed tube (pressure vessel). Product: Primary Amine ( Equation: 3. Elimination Reactions (Chemsheets Section)
The reactivity of halogenoalkanes is dictated by the strength of the
In nucleophilic substitution, a nucleophile (Nu⁻) donates a pair of electrons to the δ+ carbon, forming a new bond. As a result, the halogen (X⁻) is ejected as a leaving group. The halogen is, quite simply, swapped for another atom or group. ChemSheets AS 1139 covers three key nucleophilic substitution reactions: reactions of halogenoalkanes 1 chemsheets answers exclusive
Dissolved in pure ethanol (ethanolic), heated intensely under reflux. Role of OH−OH raised to the negative power : Base. The Elimination Mechanism: The lone pair on :OH−:OH raised to the negative power
Dissolved in ethanol/water mixture, heated under reflux. Product: Nitrile. Equation:
This is a bimolecular reaction. It happens in a single smooth step. and analyze real exam-style questions.
Zaitsev’s rule and Hofmann elimination
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Understand the curly arrows showing electron movement from the lone pair of the nucleophile to the carbon, and from the bond to the halogen. nucleophilic substitution reactions
Arrows must show the movement of an electron pair. They always go from a lone pair or a bond bond to an atom . Never draw an arrow pointing from a positive charge or an empty space. Chain Length Blunders: When using
Whether you are analyzing a halogenoalkane?
Alcohol (primary, secondary, or tertiary depending on the halogenoalkane) Example from Chemsheets: 1-bromopropane + aqueous NaOHaqueous NaOH →right arrow Propan-1-ol + Mechanism: SN2cap S sub cap N 2 (for primary) or SN1cap S sub cap N 1 (for tertiary). B. Reaction with Cyanide ( CN−CN raised to the negative power Reagent: Potassium cyanide (
