In ICSE, you find the longest carbon chain for the parent name, then number it to give the lowest locants to branches, and for isomers, just rearrange atoms without changing the formula. I learned this by scratching structures with chalk on my terrace wall during power cuts, guided only by that slow dusk light. Forget relying on steady internet—our kaiyedu from one shared textbook and frantic "yaaru chain correct?" debates with friends made it stick better than any video tutorial.
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