The correct answer is B. Methane.
An allotrope is a form of an element that has a different structure than other forms of the same element. Carbon has many allotropes, including graphite, diamond, and C-60 buckminsterfullerene. Methane is not an allotrope of carbon because it is a compound, not an element. Methane is a molecule made up of one carbon atom and four hydrogen atoms.
Graphite is a form of carbon that is made up of layers of carbon atoms that are arranged in a hexagonal pattern. The layers of carbon atoms are held together by weak forces, which allows them to slide past each other. This makes graphite a good lubricant. Graphite is also used in pencils, as it is a good conductor of electricity.
Diamond is a form of carbon that is made up of carbon atoms that are arranged in a tetrahedral pattern. The tetrahedral arrangement of carbon atoms makes diamond very strong and hard. Diamond is used in jewelry, as it is a very attractive gemstone. It is also used in industrial applications, such as cutting tools and abrasives.
C-60 buckminsterfullerene is a form of carbon that is made up of 60 carbon atoms that are arranged in a spherical shape. C-60 buckminsterfullerene is also known as a buckyball. Buckyballs are very stable and have a variety of potential applications, such as in medicine and materials science.
In conclusion, the correct answer to the question “Which of the following is not the allotrope of carbon?” is B. Methane. Methane is not an allotrope of carbon because it is a compound, not an element.