Question
When mixed ethers in which primary or secondary alkyl group is present is treated with one mole of HI , the iodide ion $\left( I ^{-}\right)$goes to which alkyl group and why?
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Answer
When mixed ether containing primary or secondary alkyl group reacts with HI, then the iodide ion goes to that alkyl group of the ether which is simpler and less steric hindrance. Due to the large size of iodide ion, it does not attached with larger or more substituted alkyl group.
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