Exactly 1 mole of propyne reacts completely with an excess of bromine dissolved in carbon tetrachloride () in the dark. How many moles of diatomic bromine () are consumed by the alkyne to form the ful

Question

Exactly 1 mole of propyne reacts completely with an excess of bromine dissolved in carbon tetrachloride ($Br_2/CCl_4$) in the dark. How many moles of diatomic bromine ($Br_2$) are consumed by the alkyne to form the fully saturated tetrahalogen derivative?

Prashant Kotian · Accepted Answer

Correct answer: 2. Alkynes possess two -bonds and can undergo two successive electrophilic addition reactions with halogens. One mole of propyne () will react with one mole of to form a dibromoalkene, which then rapidly reacts with a second mole of to form 1,1,2,2-tetrabromopropane. Therefore, 2 moles of are consumed per mole of alkyne.

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