Answers edited by il maestro

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• What are the structural isomers of cyclic C5H8CL2?
  
• How can I make acetophenone from benzene?
  
• Question #281de
  
• How many straight-chain isomers are there of hexene, #C_6H_12#?
  
• 100 liters of water for softening needed 15.9 grams of #Na_2CO_3#. What was the hardness of water?
  
• Question #635c0
  
• This is the question of organic chemistry."W" &"X"are optically active isomer of C5H9Cl."W" on treatment with one mole of H2 converted into optically active compound "Y"but "X" gives an optically active compound "Z"under the same condition.please read?