Melting and boiling points of alkynes are lower than those of the corresponding alkenes.

Answer

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that the melting and boiling points of alkynes are lower than those of the corresponding alkenes. To analyze this, we need to compare the structures and bonding of alkenes and alkynes.

2. **Structure of Alkenes and Alkynes**:
- Alkenes contain a carbon-carbon double bond (C=C).
- Alkynes contain a carbon-carbon triple bond (C≡C).
- The triple bond in alkynes is shorter and stronger than the double bond in alkenes.

3. **Molecular Packing**:
- Alkynes are linear molecules due to the triple bond, which allows them to pack more closely together compared to alkenes, which have a bent structure due to the double bond.
- This close packing in alkynes leads to stronger intermolecular forces, specifically van der Waals forces.

4. **Intermolecular Forces**:
- The strength of intermolecular forces affects the melting and boiling points of substances. Stronger intermolecular forces result in higher melting and boiling points.
- Since alkynes have stronger intermolecular forces due to their linear structure and close packing, they generally have higher melting and boiling points than alkenes.

5. **Conclusion**:
- Therefore, the initial statement is incorrect. In fact, alkynes have higher melting and boiling points than the corresponding alkenes due to their linear structure and stronger intermolecular forces.

**Final Statement**: The melting and boiling points of alkynes are higher than those of the corresponding alkenes.

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