Choose the correct statements from the given:
 
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Carbamide (\(CH_3N_2O\)) is widely regarded as the first organic compound synthesised from inorganic chemicals.
Specific molecular formula is used to represent the homologous series.
Onion retains the odour in \(NaOH\) solution.
IUPAC rule 3: In the case of alkenes and alkynes, find the double or triple bond and use its locant number followed by a dash and a primary suffix.
  
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