Japan’s Nissan Motor Company says its chairman, Carlos Ghosn, has been arrested and will be dismissed from his position. He is accused of under-reporting his earnings and misusing company money. Nissan’s chief executive officer, Hiroto Saikawa, confirmed that Ghosn was arrested on Monday. He announced that Ghosn was detained after being questioned by Japanese government lawyers after he arrived in Japan. The development surprised many people and raised questions about the partnership of Nissan, Renault and Mitsubishi Motors. Together, the three companies make up one of the world’s biggest car manufacturing groups. Nissan said that Ghosn and another company official, Greg Kelly, are accused of misusing millions of dollars. It said an investigation was launched after someone inside the company told officials about suspected wrongdoing. Kelly also was arrested.