Answer: Tertiary carbocation.
- A Methyl carbocation
- B Primary carbocation
- C Secondary carbocation
- D Tertiary carbocation
Correct answer: D. Tertiary carbocation
Explanation: Tertiary carbocations are most stable due to hyperconjugation and electron donating alkyl groups.
Geometric (cis-trans) isomers of 1,2-dichloroethene differ only in the relative arrangement of groups across the rigid C=C double bond.
Concept context
General Organic Chemistry covers the rules behind all organic reactions. Covers inductive effect, resonance, hyperconjugation, types of reactions (substitution, addition, elimination), and isomerism including optical and geometric forms.
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