Chapter 22 Hydrocarbons Notes - Class 10 Chemistry Punjab Board
Chapter-wise notes for Class 10 Chemistry Chapter 22, Hydrocarbons, prepared for Punjab Board students, with solved exercises, MCQs, and numericals available to read online.
Chapter Overview
Chapter 22 of Class 10 Chemistry, Hydrocarbons, focuses on unsaturated aliphatic hydrocarbons – specifically alkenes and alkynes. It details standard laboratory and industrial preparation methods for alkenes, including the catalytic dehydration of alcohols with concentrated sulphuric acid, dehydrohalogenation of alkyl halides using alcoholic potassium hydroxide, and thermal or catalytic cracking of higher alkanes into useful smaller alkenes.
The chapter provides in-depth chemical reaction mechanisms for characteristic addition reactions across the carbon-carbon double bond, such as catalytic hydrogenation, halogenation, Baeyer's oxidation test with cold alkaline potassium permanganate (KMnO4), addition of hydrogen halides, and hydration with steam to form alcohols. In addition, it details the properties of alkynes, natural geological sources of hydrocarbons, and the industrial fractional distillation refining of crude petroleum into commercial fuels and lubricants based on boiling point differentials.
Hydrocarbons is a major long-question domain in Punjab Board Matric Part 2 examinations, regularly testing chemical equations for alkene preparations, test for unsaturation, and petroleum refining fractions. These SLO-aligned solved notes for the 2026-2027 academic session ensure students across Lahore, Rawalpindi, Faisalabad, and all Punjab Boards master balanced organic equations and attain top marks in annual board exams.