Arrange `C-C,C=C` and `C-=C` in order of
(i) Decreasing bond dissociation energy
(ii) Decreasing bond lengths

Explanation

To solve the problem of arranging `C-C`, `C=C`, and `C≡C` in order of (i) decreasing bond dissociation energy and (ii) decreasing bond lengths, we can follow these steps:

### Step 1: Understand Bond Dissociation Energy
Bond dissociation energy is the amount of energy required to break a bond between two atoms. Generally, the more bonds there are between two atoms, the stronger the bond, and thus the higher the bond dissociation energy.

### Step 2: Analyze the Bonds
- **C-C (single bond)**: This bond consists of one sigma bond.
- **C=C (double bond)**: This bond consists of one sigma bond and one pi bond.
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