The presence of carbon in an organic compound can be shown by:
(A) Heating the compound with sodium
(B) Heating the compound with cupric oxide
(C) Heating the compound on Bunsen flame
(D) Heating the compound with magnesium

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Hint: To prove the presence of carbon you have to do qualitative analysis. This analysis is basically used to prove the presence of the elements, functional groups , substance in an organic or inorganic molecule.

Complete step by step solution:
This qualitative analysis is important to know to find out the elements of the compound you use in research work. This analysis is performed by doing some reaction which results in some specific physiological change of the reaction medium for a specific reaction. The organic compounds are basically made of carbon , hydrogen. Nitrogen, halogen, oxygen, sulfur etc. to detect the presence of these elements in an organic compound, there are some reactions of qualitative analysis.
One of those to determine carbon , heating the compound with the cupric oxide is one of the efficient analyses.
In this reaction, the carbon elements of the compound get oxidized into carbon dioxide. This carbon dioxide can turn the lime water milky.
The reaction of this analysis is shown below,
\[
  {\text{C + 2CuO }} \to {\text{C}}{{\text{O}}_{\text{2}}}{\text{ + 2Cu}} \\
  {\text{C}}{{\text{O}}_{\text{2}}}{\text{ + Ca(OH}}{{\text{)}}_{\text{2}}} \to {\text{CaC}}{{\text{O}}_{\text{3}}}{\text{(Milky) + }}{{\text{H}}_{\text{2}}}{\text{O}} \\
 \]

So, the correct answer is B.

Note: Qualitative analysis is basically used to prove the presence of the elements, functional groups , and substance in a molecule. To determine carbon , heating the compound with the cupric oxide is one of the efficient analyses. There are so many other different methods to identify the elements like Nitrogen, halogen, oxygen, sulfur.