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Which of the following is an example of regioselective reaction?

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Which of the following is an example of regioselective reaction?

(a) Debromination of 2,3- dibromobutane

(b) 2-bromo octane with sodium hydroxide

(c) Addition of HI to propylene

(d) Debromination of meso dibromobutane

I had been asked this question in a national level competition.

My question is from Stereoselectivity and Stereospecificity topic in division Structure and Stereostructure of Molecules of Engineering Chemistry I

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Correct answer is (c) Addition of HI to propylene

The explanation is: Addition of HI to propylene is an example of regioselective reaction. Regioselectivity is the preference of one direction of chemical bond making or breaking over all other possible directions.

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