Mind Map For Hydrocarbons: Alkanes | Class 11, JEE & NEET - Download from here

The general formula of alkanes is CₙH₂ₙ₊₂, where n is the number of carbon atoms. All carbon atoms are sp³-hybridised with single bonds only. Methane (CH₄) is the simplest alkane. This formula is the starting point for distinguishing alkanes from alkenes (CₙH₂ₙ) and alkynes (CₙH₂ₙ₋₂) in MCQs.

The Wurtz reaction combines two alkyl halide molecules using sodium metal in dry ether to form a higher alkane. It is important for JEE because it tests your ability to predict products — especially when mixed halides are used, giving three different alkane products. The symmetrical product is easiest to miss under exam pressure.

Hydrocarbons as a whole typically contributes 1–3 questions per JEE Main paper across shifts, according to NTA's official exam pattern trends. Alkanes specifically feature in questions on preparation methods, free radical halogenation, and physical property comparisons. NEET papers follow a similar pattern with 2–3 hydrocarbons questions per paper.

Kolbe's electrolysis involves the electrolysis of an aqueous solution of sodium or potassium salt of a carboxylic acid. At the anode, carboxylate ions lose an electron, release CO₂, and the resulting alkyl radicals combine to form an alkane. The alkane formed has twice the carbon chain length of the original acid's alkyl group.

The mind map is an excellent revision tool but should not replace your first-read of NCERT. For NEET, NCERT Class 11 Chemistry Chapter 13 is the primary source — the mind map helps you consolidate what you have already studied. Pair it with previous year NEET questions on hydrocarbons for best results.