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# The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms is called by

$\begin{array}{1 1}(a)\;\text{Saytzeff rule}&(b)\;\text{Markownikoff's rule}\\(c)\;\text{Kharasch effect}&(d)\;\text{Anti-saytzeff rule}\end{array}$

According to Markownikoff's rule,the negative part of the unsymmetrical reagent adds to less hydrogenated (more substituted) carbon atom of the double bond
Hence (b) is the correct option.