Why is diamond used for making cutting tools (like glass cutters) but graphite is not?

$$\begin{gathered} \mathrm{A}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}} \\ \mathrm{B}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2} \\ \mathrm{C}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}. \end{gathered}$$

Enter your correct answer as A, B or C.

$$\begin{gathered} \mathrm{A}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}} \\ \mathrm{B}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2} \\ \mathrm{C}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}. \end{gathered}$$

Enter your correct answer as A, B or C.

$$\begin{gathered} \mathrm{A}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}} \\ \mathrm{B}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2} \\ \mathrm{C}={\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}. \end{gathered}$$

Enter your correct answer as A, B or C.

Friedrich Wohler converted an inorganic compound into an organic compound in the laboratory.
(i) Give the name and formula of the inorganic compound.
(ii) Write the name and formula of the organic compound formed.
Also, Give the molecular formula of butane and mention the names of its two isomers. Name one fuel which contains both these isomers

Which of the following is the molecular formula of benzene?
$$\begin{gathered} \mathrm{A}; {\mathrm{C}}_6{\mathrm{H}}_6 \\ \mathrm{B}; {\mathrm{C}}_6{\mathrm{H}}_{10} \\ \mathrm{C}; {\mathrm{C}}_6{\mathrm{H}}_{12} \end{gathered}$$

Enter your correct answer as A, B or C.