Hello sapna,
The correct answer for your question is methane.
For more assistance and detailed solution of this problem kindly refer the below mentioned article:
https://learn.careers360.com/medical/question-can-someone-help-me-with-this-hydrocarbon-a-reacts-with-bromine-by-substitution-to-form-an-alkyl-bromide-which-by-wurtz-reaction-is-converted-to-gaseous-hydrocarbon-containing-less-than-four-carbon-atoms-a-is/ Hope this Helps
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