All of the following contain carbon, except

proteins

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PVC

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paper

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aqua regia

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Solution

The correct option is D aqua regia
Proteins are the constituent of our body as well as food. So, they contain carbon.
PVC contains carbon, paper is made up of cellulose which has carbon.
Aqua regia is the mixture of conc. HCl and $c o n c . H N O_{3}$ in the ratio 3 :1. It does not contain carbon

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