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Alkenes - AQA A-Level Chemistry Exam 2025 Questions and Answers Unsaturated hydrocarbons. - --CORRECT ANSWER--What are alkenes? There is at least one carbon-carbon double bond so there are less hydrogen atoms. - --CORRECT ANSWER--What is meant by unsaturated? A compound that only has carbon and hydrogen atoms. - --CORRECT ANSWER--What is meant by a hydrocarbon? CnH2n - --CORRECT ANSWER--What is the general formula for alkenes? A double covalent bond which are centres of high electron density, making alkenes reactive. - --CORRECT ANSWER--What does the bonding in alkenes involve? They have a carbon carbon double bond which are centres of high electron density. - --CORRECT ANSWER--Why are alkenes reactive? They have 2 fewer hydrogen atoms than their straight chain version of the same molecule. - --CORRECT ANSWER--How do cycloalkenes differ to regular alkenes? ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1