**Checking the Stability of Cyclic Compounds**

Cyclic compounds are organic compounds that contain a closed ring of atoms. The stability of cyclic compounds can be determined by considering various factors such as strain, resonance, and aromaticity. In the case where all the rings are aromatic, the stability can be further analyzed based on Huckel's rule.

**1. Strain:**
Strain refers to the energy associated with the distortion of bond angles and bond lengths in a cyclic compound. If a cyclic compound is heavily strained, it tends to be less stable. Strain can arise from ring size, non-planarity, or the presence of large substituents. Larger rings usually have more strain due to the deviation from ideal bond angles and lengths.

**2. Resonance:**
Resonance is an important factor in determining the stability of cyclic compounds. If a cyclic compound can exhibit resonance structures, it tends to be more stable. Resonance allows for delocalization of electrons, which lowers the overall energy of the compound. The presence of conjugated double bonds within the ring increases the stability through resonance.

**3. Aromaticity:**
Aromaticity plays a significant role in determining the stability of cyclic compounds. Aromatic compounds exhibit extraordinary stability due to their delocalized π-electrons, which creates a lower energy state. For a cyclic compound to be aromatic, it must fulfill the following criteria:
- The compound must be cyclic.
- It must be planar.
- It must possess a continuous ring of overlapping p-orbitals.
- It must have 4n + 2 π-electrons, where n is an integer (known as Huckel's rule).

**Huckel's Rule:**
Huckel's rule states that a cyclic compound with 4n + 2 π-electrons will be aromatic, while those with 4n π-electrons will be antiaromatic. Aromatic compounds are significantly more stable than their non-aromatic counterparts, while antiaromatic compounds are highly unstable. Therefore, cyclic compounds that fulfill Huckel's rule and possess aromaticity will exhibit exceptional stability.

To check the stability of cyclic compounds, it is essential to consider the overall strain, resonance possibilities, and the potential for aromaticity. By assessing these factors, one can determine the relative stability of cyclic compounds and understand their reactivity and behavior in different chemical reactions.

Same number of double bonds r der and no charges in cyclic compound ...just double bonds are displaced ...how will we do nw??