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Formula Sheet

Hydrocarbons — Formula Sheet

CBSE · Class 11 · Chemistry

11 formulas from Hydrocarbons (CBSE Class 11 Chemistry) on one page, grouped by topic. Part of the CBSE Class 11 Chemistry syllabus.

76 questions94 flashcards11 formulas & key relations5 concepts

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11 Entries · 3 Sections

Formulas and Key Relations

1. Core Classification and Basics

General formula of alkanes: CnH2n+2

General formula of alkenes: CnH2n

General formula of alkynes: CnH2n-2

General formula of alkyl groups: CnH2n+1

2. Alkanes: Isomerism, Preparation, and Reactions

General combustion of alkanes: CnH2n+2 + (3n+1)/2 O2 -> nCO2 + (n+1)H2O

General combustion of any hydrocarbon: CxHy + (x + y/4)O2 -> xCO2 + (y/2)H2O

Combustion of methane: CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l); ΔcH° = -890 kJ mol-1

Combustion of butane: C4H10(g) + 13/2 O2(g) -> 4CO2(g) + 5H2O(l); ΔcH° = -2875.84 kJ mol-1

4. Alkenes: Structure, Isomerism, Preparations, and Reactions

C=C sigma bond enthalpy about 397 kJ mol-1; pi bond about 284 kJ mol-1

C=C double bond length = 134 pm; C-C single bond = 154 pm

C=C bond enthalpy = 681 kJ mol-1; C-C single bond in ethane = 348 kJ mol-1

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Frequently Asked Questions

What are the important topics in Hydrocarbons for CBSE Class 11 Chemistry?
Key topics in Hydrocarbons include Classification and Importance of Hydrocarbons, Alkanes: Structure, Naming, Isomerism, and Preparation, Conformations of Ethane, Alkenes: Structure, Isomerism, Preparation, and Reactions. Study these first, then practise questions on each for Class 11 exams.
How many formulas are in Hydrocarbons?
This sheet lists 11 formulas from Hydrocarbons, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Hydrocarbons for Class 11 exams?
Learn the core ideas first, then work through the 76 practice questions on Hydrocarbons. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Hydrocarbons

All CBSE Class 11 Chemistry Formula Sheet

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