Which one of the following does not come under institutional writing?

The correct option is Notes of Condolence.

Institutional writing refers to official, formal, or professional documentation produced within or on behalf of an organization, business, or institution. It serves specific administrative, professional, or analytical purposes and adheres to formal structures and professional tones.

Let us analyze the given options:

1. Business Letter: A formal communication used by organizations for official transactions, correspondence, and professional record-keeping. Therefore, it comes under institutional writing.
2. Curriculum Vitae (CV): A standard professional document outlining an individual's career, education, and qualifications used in academic and professional institutional contexts. Hence, it falls under institutional writing.
3. Reviews: Critical evaluations of products, services, research, or books written for professional publications, academic journals, or business reports. These are forms of institutional/professional writing.
4. Notes of Condolence: These are personal, emotional messages expressing sympathy to someone who has experienced a loss. Because they are personal and informal in nature rather than official organizational documentation, they do not fall under institutional writing.

Thus, Notes of Condolence is the correct answer.