Which of the following general properly of geometrical isomer is mis`-`match?

Options

A. Dipole moment `rarr` cis `gt` Trans
B. Stability `rarr`cis `lt` Trans
C. Boling point `rarr` cis `gt` Trans
D. Melting Point `rarr` cis `gt` Trans

Explanation

To solve the question regarding the mismatch of properties of geometrical isomers, we will analyze each property mentioned and determine which one does not align with the established characteristics of cis and trans isomers.

### Step-by-Step Solution:

1. **Understanding Geometrical Isomerism**:
- Geometrical isomerism occurs due to restricted rotation around a double bond, leading to different spatial arrangements of substituents. The two main types are cis (same side) and trans (opposite side).

**Hint**: Remember that geometrical isomers arise from the inability to rotate freely around a double bond.

2. **Analyzing Dipole Moment**:
- The dipole moment is greater for cis isomers than for trans isomers. This is because, in the cis configuration, the dipole moments of the substituents do not cancel out, while in the trans configuration, they do.

**Hint**: Consider how the arrangement of polar bonds affects the overall dipole moment.

3. **Stability of Isomers**:
- Trans isomers are generally more stable than cis isomers due to less steric hindrance (repulsion between bulky groups). Thus, trans isomers are less reactive.

**Hint**: Think about how the spatial arrangement of atoms affects their stability and reactivity.

4. **Boiling Point Comparison**:
- The boiling point of cis isomers is higher than that of trans isomers due to the greater polarity of cis isomers, which results from their dipole moments. The increased polarity leads to stronger intermolecular forces.

**Hint**: Relate boiling point to polarity and the strength of intermolecular forces.

5. **Melting Point Analysis**:
- The melting point of trans isomers is typically higher than that of cis isomers. This is because trans isomers can pack more symmetrically in a crystal lattice, leading to stronger intermolecular forces.

**Hint**: Consider how symmetry in molecular packing influences melting points.

6. **Identifying the Mismatch**:
- After analyzing all properties, we find that the statement regarding the melting point is incorrect. It states that cis has a higher melting point, which is a mismatch because trans has a higher melting point due to symmetrical packing.

**Conclusion**: The mismatch property is that the melting point of cis isomers is not greater than that of trans isomers.

### Final Answer:
The mismatch property of geometrical isomers is that the melting point of cis isomers is greater than that of trans isomers.