Which one of the following statements is not correct?

Graphite is a crystalline allotrope of carbon [2]. As carbon is a non-metal, graphite is classified as a non-metal [3]. Structurally, graphite consists of carbon atoms arranged in hexagonal rings forming two-dimensional layers. Each carbon atom is bonded to three others in a trigonal planar geometry (sp2 hybridization), leaving one delocalized electron per atom that allows it to conduct electricity [2]. In contrast, diamond has a tetrahedral structure where each carbon atom is bonded to four others in a three-dimensional lattice (sp3 hybridization) [2]. Therefore, the statement that graphite has a tetrahedral structure is incorrect, as that property belongs to diamond. Graphite's layers are held together by weak van der Waals forces, making it soft and slippery [1].

Sources

1. [2] Science , class X (NCERT 2025 ed.) > Chapter 3: Metals and Non-metals > Table 3.1 > p. 40
2. [3] https://www.sciencedirect.com/topics/engineering/carbon-allotrope
3. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > Allotropes of carbon > p. 61