Hey Harleen.

CEO is a Chief Executive Officer of any organisation, company etc who is in charge of running the organisation and has many responsibilities. In order to become a CEO you need to have adequate knowledge and experience in the management field. Hence pursuing Undergraduation in a related  stream woul be more beneficial for you. Though you can complete an Undergraduate degree in any field related to science too and complete an MBA degree after that. But by taking UG in a related field  you will have a fair base of knowledge of management as well as other areas as required in this field as here you will be taught about various fields of management, accountancy, business environment, finance etc which will be very beneficial for you in the process.

Best of luck