Podcast
Questions and Answers
Which physical property of alkynes is mainly influenced by the presence of the triple bond?
Which physical property of alkynes is mainly influenced by the presence of the triple bond?
- Existence state (Gas, liquid, solid)
- Boiling point (correct)
- Solubility
- Melting point
How does the increase in the number of carbon atoms in alkynes affect their boiling points?
How does the increase in the number of carbon atoms in alkynes affect their boiling points?
- Boiling points remain constant
- Boiling points decrease
- Boiling points fluctuate unpredictably
- Boiling points increase (correct)
Based on the general formulas provided, which alkynes are expected to be gases?
Based on the general formulas provided, which alkynes are expected to be gases?
- HC ≡ C(CH2)3CH3 (1-Hexyne)
- HC ≡ CH (Ethyne) (correct)
- HC ≡ C(CH2)7CH3 (1-Decyne)
- HC ≡ CCH3 (Propyne)
Which property of alkenes makes them highly reactive towards a wide variety of reagents?
Which property of alkenes makes them highly reactive towards a wide variety of reagents?
What is the general formula for alkynes?
What is the general formula for alkynes?
How are most alkenes named according to the IUPAC system?
How are most alkenes named according to the IUPAC system?
Why do alkenes have a higher melting point compared to alkanes?
Why do alkenes have a higher melting point compared to alkanes?
How does boiling point change with an increase in carbon atoms in alkenes?
How does boiling point change with an increase in carbon atoms in alkenes?
Why are lower members of alkenes sparingly soluble but soluble in organic solvents?
Why are lower members of alkenes sparingly soluble but soluble in organic solvents?
What is the general formula for alkynes?
What is the general formula for alkynes?
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.
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Description
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.
