Question detail
What is the general formula for the homologous series of alkenes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
- A. C_nH_{2n}
- B. C_nH_{2n+2}
- C. C_nH_{2n-2}
- D. C_nH_{n}
Answer
The correct option is C_nH_{2n}.
Explanation
The correct option is C_nH_{2n}. C_nH_{2n} is correct because it directly supports the approved learning objective to in addition polymers, the repeating unit has the same atoms as the monomer because no other molecule is formed in the reaction. This belongs to Polymerisation and naturally occurring polymers within Reactions of alkenes and alcohols (chemistry only), so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Confusing Repeating Units
Students often think that the repeating unit in addition polymers is different from the monomer, leading to incorrect representations.
Remember that in addition polymers, the repeating unit is identical to the monomer since no other molecule is produced during the reaction.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.