Which one of the following statements is not correct?

Statement 1 is incorrect because most carbon compounds are poor conductors of electricity [2]. This is because carbon compounds are primarily formed through covalent bonding, which involves the sharing of electrons between atoms rather than the transfer of electrons [4]. Consequently, these compounds do not give rise to free ions or mobile electrons necessary for electrical conductivity [2]. In contrast, statement 2 is correct as organic compounds are characterized by covalent bonds [4]. Statement 3 is correct because graphite's layered structure, held by weak intermolecular forces, allows layers to slide over each other, making it smooth, slippery, and suitable as a lubricant [1]. Statement 4 is also correct; diamond and graphite are the most common allotropes of carbon, representing different physical forms of the same element [1].

Sources

1. [2] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 59
2. [4] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 60
3. [3] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.2 VERSATILE NATURE OF CARBON > p. 62
4. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > Allotropes of carbon > p. 61