Reactions Of Halogenoalkanes 1 Chemsheets Answers Exclusive ((install)) -

Halogenoalkanes undergo nucleophilic substitution to form alcohols, nitriles, or amines, and elimination reactions to produce alkenes, depending on the reagent and conditions. Key reactions include the use of hydroxide, cyanide, and ammonia, with reactivity influenced by the C-X bond strength. For the full study guide and answer keys, visit scisheets.co.uk. REACTIONS OF HALOGENOALKANES 1 | Chemsheets

Q3: Product of 1-bromopropane + ethanolic KOH?

• Propene (major via E2) + small amount of propan-1-ol? No – ethanol with KOH drives elimination. Minor substitution gives 1-ethoxypropane (Williamson ether).

A3: The product of the reaction between iodoethane and silver nitrate is silver iodide and ethanol. reactions of halogenoalkanes 1 chemsheets answers exclusive

. This is a vital reaction because it increases the carbon chain length. Conditions: Ethanol solvent, reflux. With Ammonia (NH₃): The halogen is replaced by an -NH₂ group , forming a primary amine Conditions: Excess ammonia, ethanolic, heated in a sealed tube. 2. Elimination Reactions Under different conditions, the hydroxide ion acts as a Propene (major via E2) + small amount of propan-1-ol

• Step 1: The C–Halogen bond breaks heterolytically first. A carbocation intermediate forms. (This is the slow, rate-determining step).
• Step 2: The nucleophile ($OH^-$) attacks the carbocation.
• Key Insight: The rate only depends on the halogenoalkane. Rate = $k[Halogenoalkane]$.

• Mechanism: Base abstracts a β-hydrogen while the C–X bond breaks, forming an alkene in a single step.
• Kinetics: Rate = k[RX][base].
• Stereochemistry: Anti-periplanar geometry between H and X is often required for the transition state (important in cyclic systems and stereoselectivity).
• Favoured by: Strong bases (e.g., OH–, OR–, bulky bases like t-BuO–), higher temperatures, secondary and tertiary haloalkanes.
• Example: CH3CHBrCH3 + OH– → CH3CH=CH2 + Br– + H2O.

Leaving Group: The arrow should go from the C-X bond to the halogen atom ( ) as the bond breaks.  A3: The product of the reaction between iodoethane

"Reactions of Halogenoalkanes 1" Chemsheets cover nucleophilic substitution and elimination reactions, emphasizing mechanisms involving OH⁻, CN⁻, and NH₃. Key takeaways include the trend in reactivity where iodoalkanes react fastest due to bond strength, alongside the distinction between SN1cap S sub cap N 1 SN2cap S sub cap N 2