REGIONAL CHAMPIONSHIP 2024
GOIL REGIONAL CHAMPIONSHIP — GRAND FINAL, BONO AHAFO ZONE
Sunyani Senior High School: 38 points (Winner)
St. James Seminary & Senior High School: 31 points
Kintampo Senior High School: 30 points
Our Lady of Mount Carmel Girls' Senior High School: 18 points
QUESTION
Give the name of one product formed when 2-methylbutane undergoes monochlorination.
ANSWER: 2-chloro-2-methylbutane, 1-chloro-2-methylbutane, 2-chloro-3-methylbutane, or 1-chloro-3-methylbutane (each accepted once)
SOLUTION:
2-Methylbutane, $(CH_3)_2CHCH_2CH_3$, has four chemically distinct hydrogen environments (the two equivalent C1/branch methyls count as one type), giving exactly four monochlorination products: chlorinating the tertiary C2–H gives 2-chloro-2-methylbutane; either terminal methyl on C2 gives 1-chloro-2-methylbutane; the C3 methylene gives 2-chloro-3-methylbutane; and the C4 methyl gives 1-chloro-3-methylbutane.
---
PRACTICE QUESTIONS
1. QUESTION: Give the name of one product formed when propane undergoes monochlorination.
ANSWER: 1-chloropropane or 2-chloropropane
SOLUTION:
Propane has two kinds of hydrogen.
2. QUESTION: Give the name of one product formed when butane undergoes monochlorination.
ANSWER: 1-chlorobutane or 2-chlorobutane
SOLUTION:
Butane has primary and secondary hydrogens.
3. QUESTION: Give the name of one product formed when 2-methylpropane undergoes monochlorination.
ANSWER: 1-chloro-2-methylpropane or 2-chloro-2-methylpropane
SOLUTION:
2-methylpropane has primary and tertiary hydrogens.
4. QUESTION: Give the name of one product formed when pentane undergoes monochlorination.
ANSWER: 1-chloropentane, 2-chloropentane or 3-chloropentane
SOLUTION:
Pentane has three kinds of hydrogen.
5. QUESTION: Give the name of the product formed when 2,2-dimethylpropane undergoes monochlorination.
ANSWER: 1-chloro-2,2-dimethylpropane
SOLUTION:
All its hydrogens are equivalent, so only one product forms.
6. QUESTION: Give the name of the product formed when ethane undergoes monochlorination.
ANSWER: Chloroethane
SOLUTION:
Ethane has only one kind of hydrogen.