2. draw the structural formula for ethene (c₂h₄).\n3. draw the structural formula for propyne (c₃h₄).

2. draw the structural formula for ethene (c₂h₄).\n3. draw the structural formula for propyne (c₃h₄).

2. draw the structural formula for ethene (c₂h₄).\n3. draw the structural formula for propyne (c₃h₄).

Answer

Brief Explanations:

For ethene ($C_2H_4$), carbon - carbon double bond exists. Each carbon is bonded to two hydrogens. For propyne ($C_3H_4$), there is a carbon - carbon triple bond with one carbon bonded to 3 hydrogens and the other terminal carbon bonded to one hydrogen.

Answer:

  1. The structural formula of ethene ($C_2H_4$) is $H_2C=CH_2$.
  2. The structural formula of propyne ($C_3H_4$) is $CH_3C\equiv CH$.