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What this chapter covers:
Type A: Identifying Alkenes
Type B: Naming Alkenes
Problem:
Given:
Answer:
โ Mistake 1: Forgetting to number the carbon chain correctly when naming alkenes.
โ Mistake 2: Not identifying cis-trans isomers correctly.
When naming alkenes, always prioritize the double bond when numbering the parent chain, even if it means a substituent gets a higher number.
What this chapter covers:
Type A: Predicting Solubility
Type B: Comparing Boiling Points
Problem:
Given:
Answer:
โ Mistake 1: Confusing boiling point and melting point trends for cis and trans isomers.
โ Mistake 2: Ignoring the effect of branching on boiling points.
Remember that boiling point increases with molecular weight and decreases with branching. Cis isomers generally have higher boiling points than trans isomers.
What this chapter covers:
Type A: Dehydration Product Prediction
Type B: Dehydrohalogenation Product Prediction
Problem:
Given:
Answer:
โ Mistake 1: Forgetting to consider Zaitsev's rule when predicting products of dehydrohalogenation.
โ Mistake 2: Not identifying all possible alkene products.
Remember Zaitsev's rule: "The alkene with the most alkyl groups attached to the double-bonded carbons is the major product."
What this chapter covers:
Type A: HX Addition Product Prediction
Type B: X2 in CCl4 Addition Product Prediction
Type C: X2 in Water Addition Product Prediction
Problem:
Given:
Answer:
โ Mistake 1: Applying Markovnikov's rule incorrectly.
โ Mistake 2: Forgetting the mechanism of electrophilic addition.
Remember Markovnikov's rule: "The hydrogen adds to the carbon with more hydrogens already attached."
What this chapter covers:
Type A: Catalytic Hydrogenation Product Prediction
Type B: Combustion Product Prediction
Type C: Oxidation Product Prediction (Mild & Strong)
Problem:
Given:
Answer:
โ Mistake 1: Not balancing combustion equations correctly.
โ Mistake 2: Confusing mild and strong oxidation products.
For oxidation reactions, remember that strong oxidation breaks the double bond, leading to smaller molecules like carboxylic acids, ketones, or CO2.
What this chapter covers:
Type A: Identifying Alkenes Using Bromine Test
Problem:
Given:
Answer:
โ Mistake 1: Confusing the bromine test with other tests.
โ Mistake 2: Not understanding the reason for the color change.
Remember that the bromine test is a simple and effective way to identify alkenes based on the decolorization of bromine solution.