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Addition of Halogen Acid for Alkynes

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Question

During the addition of $H B r$ in presence of a radical initiator peroxide, to an alkyne, the product, bromoalkene does not undergo an addition reaction with $H B r$ till all alkyne are exhausted, though alkene is more reactive than alkyne towards free radical addition reaction, explain.

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Solution

During addition of $H B r$ in presence of a radical initiator peroxide,to an alkyne, the product,bromoalkene does not undergo addition reaction with $H B r$ till all alkyne are exhausted, though alkene is more reactive than alkyne towards free radical addition reaction. This is because bromoalkene is less reactive than an alkyne towards free radical addition of $H B r$ .

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Q. An alkene is more reactive than an alkyne towards electrophilic addition of

H B r

H C l

to alkyne, does not react further with

H C l

H B r

till all alkyne are exhausted.
if true enter 1, if false enter 0.

Q. Identify the incorrect statement/statements :
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise

B r_{2}

water
(iv) Addition of

H B r

to alkenes in presence of peroxide proceeds via Markovnikov's rule

Q. Identify the incorrect statement/statements :
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise

B r_{2}

water
(iv) Addition of

H B r

to alkenes in presence of peroxide proceeds via Markovnikov's rule

Q. Assertion :Addition of HBr to propene yields 2-bromopropane but in presence of a peroxide it yields 1-bromopropane. Reason: When reaction is carried out in the presence of a peroxide it follows free radical mechanism,

2^{0}

free radical is more stable than

1^{0}

Q. Assertion :Addition of

H B r

in presence of peroxide

(R O O R)

to propene gives

2

-bromo propane. Reason: Reaction involves a bromine-free radical.

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