The presence of carbon in an organic compounds can be shown by:

heating the compound with sodium

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heating the compound with cupric oxide

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heating the compound on bunsen flame

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heating the compound with magnesium

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Solution

The correct option is B heating the compound with cupric oxide
Presence of carbon can be detected by heating the organic compound with cupric oxide $(C u O)$ strongly, where carbon is oxidised to carbon dioxide $(C O_{2})$ , which can be tested by lime water test.
$C In the compound + 2 C u O ⟶ C O_{2} + 2 C u$
$C O_{2} + C a {(O H)}_{3} ⟶ C a C O_{3} + H_{2} O M i l k y$

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