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When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes - CIE - A-Level Chemistry - Question 29 - 2014 - Paper 1
Question 29
When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes. What are the possible elimination products when 2-br... show full transcript
Worked Solution & Example Answer:When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes - CIE - A-Level Chemistry - Question 29 - 2014 - Paper 1
Step 1
What are the possible elimination products when 2-bromobutane is heated with KOH dissolved in ethanol?
Answer
When 2-bromobutane is heated with KOH in ethanol, it undergoes an elimination reaction, typically resulting in the formation of alkenes. The key possible elimination products include:
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2-butene (CH3CH=CHCH3): This is formed by the elimination of HBr from 2-bromobutane.
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1-butene (CH2=CHCH2CH3): This product can also result as a consequence of the elimination reaction, depending on how the bromine and hydrogen atoms are removed.
Hence, the likely products are both 1-butene and 2-butene, which corresponds to option C:
- CH3CH=CHCH2 and CH2=CHCH=CH2