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    Could someone explain Makownikoff's Rule for determining whether a substance is the major product.


    This is partly down to the number of methyl groups attached to the carbocation intermediate. These methyl groups feed electrons/electron density to the positive charge, reducing the positive charge and this actually makes it more stable. If the intermediate is more stable it is obviously more likely to form and will be available for longer- this means that there is a much greater probability of the negative species with the available lone pair to attack the more stable carbocation. And this will be your major product. Whereas the carbocation say with just one methyl group is much less stable than the one with 2 as there is not much electrons being pushed towards the positive charge ->>>> this leads to a less stable carbocation ---> your minor product. Basically the one that is the major product is the one with the most methyl groups attached to the positive carbocation

    In simple terms (will do for A-level-level): If you add H-X to a C=C, the H will attach to the C that starts with the most Hs already.
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