Discuss in brief the polymerisation reactions of alkenes ?
163 Views
Short Answer Type
173.
Enlist three uses of ethylene.
112 Views
Long Answer Type
174.
What are alkynes?
132 Views
Advertisement
175.
For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated:
199 Views
176.Write structures of different isomers corresponding to the 5th member of alkyne series. Also, write IUPAC names of all the isomers ?
373 Views
Short Answer Type
177.
How is acetylene obtained from: (i) Ethylene dibromide? (ii) Tetrabromoethane ?
Why do alkynes undergo electrophilic addition reactions ?
The electrophilic addition reactions take place in alkynes due to the presence of high electron density in the triple bond. This means that – C ≡ C – can act as a source of electrons. There are certain reagents (electrophiles) which are capable of adding to alkyne molecules forming an addition compound. Since such reactions are initiated by the electrophiles and hence are known as electrophilic addition reactions.
The addition product further reacts with E-Nu (attacking reagent) to form addition product i.e. alkane derivative.
Mechanism:
The electrophilic addition gets repeated and alkene derivative changes to alkane derivative.
129 Views
Advertisement
Short Answer Type
180.Alkynes are less reactive towards electrophilic addition reactions than alkenes. Explain.