(a) 20cm of a gaseous hydrocarbon M required 150cm of oxygen for complete
combustion. M reacts with one mole of hydrogen gas in the presence of nickel
catalyst to give the hydrocarbon N.
(1) What is the molecular formula of hydrocarbonM
Write the reaction of the hydrocarbon M with hydrogen
Write all isomers of the hydrocarbon N and their IUPAC names
(iv) Giving reason, arrange these isomers in order of increasing boiling point.​

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Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.