Which one of the following is not an allotrope of carbon? निम्नलिखित में से कौन-सा एक कार्बन का अपररूप नहीं है?

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Which one of the following is not an allotrope of carbon? निम्नलिखित में से कौन-सा एक कार्बन का अपररूप नहीं है?