Alkene Structure Isomerism And Reactions

State the general formula of a non-cyclic alkene containing one C=C double bond.

Which statement correctly describes the bonding in the C=C double bond of ethene?

Which compound exhibits E–Z (geometric) isomerism?

Determine the major organic product formed when propene reacts with HBr at room temperature.

Which set of conditions converts ethene into ethanol industrially?

When bromine water is shaken with an unknown hydrocarbon, the orange colour disappears. What does this observation confirm?

Explain why the π bond in ethene is more reactive than a typical C–C σ bond.

Why does 1-bromo-1-chloro-2-fluoroethene require the E–Z system rather than cis–trans labelling?

Which factor explains the order of carbocation stability tertiary > secondary > primary?

A margarine manufacturer treats a sample of liquid vegetable oil with hydrogen gas. Which conditions and outcome correctly describe this process?

During electrophilic addition of Br₂ to ethene, why does the non-polar Br₂ molecule act as an electrophile?

Draw the repeat unit of the polymer formed from chloroethene (CH₂=CHCl). Which is correct?

A repeat unit is drawn as –[CH₂–CH(CH₃)]ₙ–. Identify the monomer.

Suggest why poly(lactic acid) is described as biodegradable, whereas poly(ethene) is not.

Incineration of poly(chloroethene) (PVC) releases an acidic gas. Which method is used to remove it from flue gases?

A student treats but-2-ene with cold, dilute, acidified KMnO₄. State the observation and product.

Two alkenes, X and Y, have identical molecular formulae C₄H₈ but different physical properties. X melts at –139 °C and Y melts at –106 °C. Which explanation is most consistent with this observation?