A reaction flask contains a 2-bromopentane in an ethanolic solution of sodium ethoxide at room temperature and results in the formation of two olefinic products. Predict the products that would be formed from such a reaction A. 1-pentene (80%) and 2-pentene (20%) B. 1-pentene (20%) and 2-pentene (80 %) C. 1-pentene (50 %) and 2-pentene (50 %) D. 1-pentene (0 %) and 2-pentene (100 %) E. 1-pentene (100 %) and 2-pentene (0 %) 2. What reaction pathway is followed by the reaction above? A. E1 dehydrohalogenation B. E2 dehydrohalogenation C. SN1 dehydrohalogenation D. SN2 dehydrohalogenation E. A mixture of E1 and E2 pathways 3. What is responsible for the formation of different products (major and minor). A. The different activated complex involved in the mechanism. B. Bimolecular Nucleophilic substitution reaction C. Bimolecular Elimination reaction D. The hybridisation nature of the secondary carbocation E. The presence of sodium ethoxide
INSTRUCTIONS: Choose from the options A-E and explain briefly by illustrations the chemistry behind each answer.
Preamble: A reaction flask contains a 2-bromopentane in an ethanolic solution of sodium ethoxide at room temperature and results in the formation of two olefinic products.
- Predict the products that would be formed from such a reaction
A. 1-pentene (80%) and 2-pentene (20%)
B. 1-pentene (20%) and 2-pentene (80 %)
C. 1-pentene (50 %) and 2-pentene (50 %)
D. 1-pentene (0 %) and 2-pentene (100 %)
E. 1-pentene (100 %) and 2-pentene (0 %)
2. What reaction pathway is followed by the reaction above?
A. E1 dehydrohalogenation
B. E2 dehydrohalogenation
C. SN1 dehydrohalogenation
D. SN2 dehydrohalogenation
E. A mixture of E1 and E2 pathways
3. What is responsible for the formation of different products (major and minor).
A. The different activated complex involved in the mechanism.
B. Bimolecular Nucleophilic substitution reaction
C. Bimolecular Elimination reaction
D. The hybridisation nature of the secondary carbocation
E. The presence of sodium ethoxide
4. All the following is true about the reaction in question 1 except?
A. The reaction follows Zaistev’s rule
B. Sodium ethoxide is the nucleophile in this reaction
C. The more highly substituted
D. Dehydrohalogenation reaction of the
E. The starting material (reactant) is a secondary alkyl halide
5. All the following parameters would affect the rate and kinetics of the reaction except
A. Solvent medium
B. Reaction temperature
C. Reaction time
D. Geometry and structure of the alkyl halide
E. pH
6. What would be the major product when 2-iodopentane is involved in a dehydrohalogenation reaction?
A. 2-iodo-1-pentene
B. 2-pentene
C. (E)-2-pentene
D. (Z)-2-pentene
E. Cis-2-pentene
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