Match the following
List – I                                                List – II
A) Acetaldehyde,                           I) Enantiomers
     Vinylalcohol
B) Elipsed and                               II) Tautomers ethane
    staggered
C) (+)2-Butanol,                            III) Chain isomers
     (–) 2-Butanol
D) Methyl-n-                                  IV) Conformational
     propylamine isomers
                                                          V) Metamers

• In tautomerization, a hydrogen atom or proton may move from one atom to another. 
• Conformational isomers are a type of stereoisomerism in which rotations are about single bonds. 
• Chiral compounds that are superimposable mirror reflections of one another are called enantiomers.
  This type of isomerism occurs in compounds with an alkyl group surrounding a divalent element like an O or S atom or a group like -NH. Ethers and thioethers serve as examples.
  ${\mathrm{CH}}_3-\mathrm{NH}-{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3 \mathrm{and} {\mathrm{CH}}_3{\mathrm{CH}}_2-\mathrm{NH}-{\mathrm{CH}}_2{\mathrm{CH}}_3,$ are metamers.

So, option B) is correct.