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Chlorination

An alkene is ...

Question

An alkene is more reactive than an alkyne towards electrophilic addition of $H B r$ or $H C l$ to alkyne, does not react further with $H C l$ or $H B r$ till all alkyne are exhausted.
if true enter 1, if false enter 0.

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Solution

An alkene is more reactive than an alkyne towards electrophilic addition of $H B r$ or $H C l$ to alkyne, does not react further with $H C l$ or $H B r$ till all alkyne are exhausted. This is because haloalkene is less reactive than an alkyne towards electrophilic addition.

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Q. 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.

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. Alkynes are more reactive than alkene towards catalytic hydrogenation. State whether the statement is True or False

Q. Statement-I : Alkynes are more reactive than alkenes towards electrophilic reagents like

H^{+}

.
Because
Statement-II : The alkyl carbocation formed from alkene is more stable than the vinyl carbocation formed from alkyne.

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