Is Pineapple a Citrus Fruit? - A Common Question
It is common to mistake Pineapples for citrus fruit. It surely has similarities to citrus fruits, but its origin is different. Pineapples fit in with the Bromeliaceous family. Pineapple is the only real fruit to cultivate from that family. Pineapples do contain a certain amount of citric acid (Approximately 8%) that usually contributes to misunderstanding it as citrus fruit. However, it will not be considered a citrus fruit.
The similarity between Pineapple and Citrus fruits
The sole similarity between A Pineapple and citrus fruits is much like citrus fruits, Pineapples are sweet, juicy, tangy, saturated in Vitamin C, and grown in the tropical environment. Otherwise, these couldn't be much more different.

Dissimilarities between pineapple and citrus fruits
Unlike Citrus fruits, Pineapples are grown in soil. It is also called Ananas comosus sand belongs to the Bromeliaceous family, most that do not bear tasty or edible food.
Pineapples grow on small bushes with spiky leaves. They do not grow tall, and the fruit grows upright out from the center of the plant. Citrus fruits have a thick, porous peel, whereas pineapples have hard, triangle-shaped skin. Another difference is citrus fruits are grown with seeds, whereas pineapples do not have seeds, and are grown from the clippings of their crown.
What really Pineapples are?
Now, you need to be thinking that if Pineapples are not citrus fruits, then what they are. So. here's a solution to that. Pineapples are a lot of berries all fused into one fruit and connected by its central stalk.
Pineapples are the same kind of fruit as raspberries and Blackberries. These are called aggregate fruits, or even a fruit made from much smaller sections based on just one flower.

Conclusion
Pineapples are a fascinating species of fruits to gain knowledge about. Right now, the question is pineapple a citrus fruit has gotten its answer. Thus, Pineapples shouldn't be considered underneath the sounding citrus fruits despite similarities.