10 Questions
Which physical property of alkynes is mainly influenced by the presence of the triple bond?
Boiling point
How does the increase in the number of carbon atoms in alkynes affect their boiling points?
Boiling points increase
Based on the general formulas provided, which alkynes are expected to be gases?
HC ≡ CH (Ethyne)
Which property of alkenes makes them highly reactive towards a wide variety of reagents?
Unsaturated carbon-carbon double bond
What is the general formula for alkynes?
CnH2n-2
How are most alkenes named according to the IUPAC system?
By replacing the ending -ane of the corresponding alkane name with -ene
Why do alkenes have a higher melting point compared to alkanes?
Due to the higher polarization of the π electron cloud in alkenes.
How does boiling point change with an increase in carbon atoms in alkenes?
Boiling point increases.
Why are lower members of alkenes sparingly soluble but soluble in organic solvents?
Lower molecular weight of lower members.
What is the general formula for alkynes?
$C_nH_{2n-2}$
Study Notes
Alkynes
- The presence of the triple bond mainly influences the polarizability of alkynes.
- The boiling points of alkynes increase with an increase in the number of carbon atoms.
- Alkynes with 1-4 carbon atoms are expected to be gases, according to their general formulas.
Alkenes
- Alkenes are highly reactive towards a wide variety of reagents due to their high electron density.
- The general formula for alkynes is CnH2n-2.
- Most alkenes are named according to the IUPAC system by replacing the -ane suffix of the corresponding alkane with -ene.
- Alkenes have a higher melting point compared to alkanes due to their stronger intermolecular forces.
- The boiling point of alkenes increases with an increase in carbon atoms.
- Lower members of alkenes are sparingly soluble in water but soluble in organic solvents due to their non-polar nature.
- The general formula for alkynes is CnH2n-2.
Test your knowledge on naming alkynes according to different systems. Learn how to name alkynes based on the number of carbon atoms and the type of functional group present in the compound.
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