Question

To Understand the Mechanism of No 1-Bromobutane Post lab questions rstand the Mechanism of Nucleophilic Substitution (S2) Reaction: Synthesis of swer the following questions in the discussion part of the lab report of Experiment 7 on Sn2 reaction. 1. What is the purpose of refluxing the reaction mixture for 45 min? Why not simply boil the mixture in an Erlenmeyer flask? 2. When X is heated with an equal amount of Y in an inert solvent, product Z forms by SN2 mechanism. + C CH, CH CH OH a. What happens to the reaction rate if the concentration of Y is doubled? b. What happens to the reaction rate if the concentration of X is tripled and concentration of Y is doubled? c. What happens to the reaction rate if the temperature is raised? 3. Predict the products of the following SN2 reactions. 4. CH3CH2ONa + CH3CH4Cl + NAOH 4. Show how each compound might be synthesized by the S2 displacement of an alkyl halide. -CH2OH b. H2C=CH-CH2CN

Answer 1

1) Refluxing provide constant supply of heat at constant temperature. Simply boiling the mixture result in non-uniform heating and result in solvent loss whereas in Refluxing solvent get condense in condenser.

2) For SN2 reaction, rate = K[X][Y]

a) On doubling concentration of Y, rate become doubled.

b) When concentration of X is tripled and that of B is doubled then rate become 6 times.

c) Reaction rate increases on increasing temperature because more molecules have activation energy needed to undergo reaction.

3 ) Сиси, бNa + си, и с - си, си с си, си. + NaC0 » Са + маси — [ + ио + No 4 чо) о-си, каоС-см, ой “ОИ 5 Soppted on chc CamScanner + KIN ) UC=CH-CH₂CN

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