乱 means disorderly, chaotic and is a JLPT N2 kanji. It has 7 strokes and uses the bent stroke radical (乙).
Stroke order · 7 strokes
On'yomi (音読み)
ラン、ロン
Kun'yomi (訓読み)
みだ(れる)、おさ(める)、わた(る)
Radical
乙 · bent stroke
Strokes
7
How to remember 乱
A tongue (舌) and a bent hook (乙) — words getting tangled, everything in a jumble. ダイヤが乱れる — the train schedule thrown into disorder; rare in Japan, and big news when it happens.