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What addition across alkenes means
An alkene's π bond can be replaced by new bonds in an addition reaction. Conditions affect regioselectivity.
The working rule
Write the substrate, reagent and conditions before predicting a product.
Read each symbol or named operation in its stated context. Before using this rule, identify the input information and the output the question actually requests. A rule recalled from memory still needs its domain and assumptions.
Set up a valid model
Identify the species, reaction conditions and model before manipulating numbers. Balance atoms and charges where relevant. Keep amount, mass, concentration and activity conventions separate; specify when an ideal concentration approximation replaces a more exact thermodynamic description.
Distinction to understand
A reaction rule for an unsymmetrical alkene cannot be transferred without considering reagent and reaction conditions.
Explain the distinction in your own words before moving to calculation. A useful explanation identifies which assumption or reference convention would have to change for a different answer to become appropriate.
Check your understanding
Without computing a new numerical case, explain why this statement is relevant: Write the substrate, reagent and conditions before predicting a product.
Check atom and charge bookkeeping, units, signs and the identity of the species to which a statement applies. For an organic transformation, retain the substrate and conditions. A familiar reagent or periodic trend is not enough to prove every proposed product or comparison.
Continue with a deliberate learning sequence
The worked example shows one complete application. The worksheet provides a different question and a related-skill transfer task. The error clinic then asks you to diagnose a plausible wrong approach. These are separate learning activities; completion is not a prediction of an examination score.
Official sources and verification
Sources checked on 26 October 2026. A source’s date, programme and campus limit which claims it supports. Official pages may change after review.
- UEM — IEMJEE examination information
Historical examination pattern; verify the current cycle on the central portal.
- NTA — explicitly labelled JEE Main 2026 syllabus
Historical PCM syllabus reference. Lessons and exercises are independently authored, not official IEMJEE papers or verified 2027 paper predictions.
- NCERT — official textbook catalogue
Primary textbook reference for checking school-level concepts. This directory does not certify the independent lesson or establish IEM examination weightage.
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