“How do we quickly find the total number of stereoisomers in a JEE/NEET question – including optically active, meso forms, and the number of fractions in fractional distillation? In this short video, we break the trick into simple cases: dissimilar ends, similar ends with even n, and similar ends with odd n plus a pseudo‑chiral centre. Watch the examples, plug values of n into the formulas, and you’ll be able to solve these questions in seconds in your exam.” | Devender Singh

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