Petroleum originates from microscopic marine organisms (plankton) that sank to the seabed and were transformed by heat/pressure over millions of years. Coal is from land plants.
Explanation:
Ethene (C₂H₄) adds Br₂ across the double bond to form 1,2-dibromoethane. Bromine water decolorizes, a test for unsaturation. Alkanes undergo substitution.
Explanation:
Dmitri Mendeleev formulated the Periodic Law based on atomic masses and left gaps for undiscovered elements. Moseley later modified it to atomic number. Newlands gave Law of Octaves. Lavoisier classified elements into metals and non-metals.
Explanation:
Ethylene (C₂H₄) is systematically named ethene. The -ene suffix indicates a double bond. Ethane is C₂H₆, ethyne (acetylene) is C₂H₂, methane is CH₄. Ethene is an important petrochemical used to make polythene.
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