Question detail
Which of the following statements correctly describes alkenes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Alkenes
Question
- A. Alkenes are saturated hydrocarbons
- B. Alkenes contain at least one double bond
- C. Alkenes are only found in cyclic structures
- D. Alkenes have a general formula of CnH2n+2
Answer
Alkenes contain at least one double bond
Explanation
Alkenes are defined as unsaturated hydrocarbons that contain at least one carbon-carbon double bond (C=C), distinguishing them from saturated hydrocarbons like alkanes, which have only single bonds.
Common mistake
Testing for Unsaturation with Bromine Water
Students often incorrectly state that bromine water changes color when it comes into contact with alkenes without mentioning the role of unsaturation.
To correctly explain the test for unsaturation, state the formula: Bromine water (Br2) reacts with unsaturated compounds (alkenes) to form colorless dibromo compounds. Substitution: When bromine water is added to an alkene, the C=C double bond reacts with Br2. Working: The reaction leads to the decolorization of bromine water, indicating the presence of unsaturation. Answer: The bromine water will turn from brown to colorless, confirming unsaturation. Units/Conclusion: The test confirms the presence of a C=C double bond in the alkene.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.