Potato, Tomato, and Brinjal belong to the order called Solanales.

Explanation:
- The order Solanales is a group of flowering plants that belongs to the family Solanaceae.
- Solanaceae is commonly known as the nightshade family.
- It is a large family of flowering plants that includes many economically important crops, ornamental plants, and some poisonous plants as well.
- Solanaceae family includes plants such as potatoes, tomatoes, peppers, eggplants, and tobacco.
- The order Solanales also includes other families such as Convolvulaceae (morning glory family) and Polemoniaceae (phlox family).
- However, potatoes, tomatoes, and brinjals specifically belong to the Solanaceae family within the order Solanales.
- These three plants share several common characteristics that classify them under the Solanaceae family.
- Some common features of Solanaceae plants include alternate leaves, bisexual flowers, fruit in the form of a berry or capsule, and the presence of alkaloids.
- Potatoes, tomatoes, and brinjals are all herbaceous plants with leaves that are alternate in arrangement.
- They produce flowers that have both male and female reproductive structures, making them bisexual.
- The fruits of these plants are in the form of berries, which contain seeds.
- Additionally, all three plants contain alkaloids, which are chemical compounds that can have various effects on organisms.
- Solanaceae plants are known for their alkaloid content, which can be toxic to some animals and humans, but also have medicinal uses in certain cases.
- In conclusion, potatoes, tomatoes, and brinjals belong to the order Solanales and the family Solanaceae due to their shared characteristics and botanical classification.