Setting up of which one of the following not stated in the Constitution of India

The Planning Commission was not stated in the Constitution of India; it was established in 1950 through an executive resolution of the Government of India, making it a non-constitutional and non-statutory body [c1, t8]. In contrast, the other options are explicitly provided for within the constitutional text. The Finance Commission is established under Article 280 as a quasi-judicial body [c5, t4]. The Election Commission of India is an autonomous constitutional authority mandated by Article 324 to oversee elections [t2, t5]. The Union Public Service Commission (UPSC) is directly created by the Constitution under Articles 315-323 [c2, t10]. While constitutional bodies require a formal amendment for structural changes, the Planning Commission (now replaced by NITI Aayog) operated as an advisory organ of the executive [c1, t6].

Sources

1. [1] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 46: Finance Commission > ADVISORY ROLE > p. 432
2. [2] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 46: Finance Commission > CHAPTER" 46 Finance Commission > p. 431
3. [3] https://fincomindia.nic.in/
4. [4] https://eci.gov.in/about-eci
5. [5] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 45: State Public Service Commission > JOINT STATE PUBLIC SERVICE COMMISSION > p. 430