Which one does NOT belong?

Exercise and reference answers

Questions

1. Items

   1. Ethene
   2. Methane
   3. Ethane
   4. Propane

   Reason

   Ethene has a double bond, so it is an alkene. The other three are saturated alkanes.

   Odd item

   Ethene

2. Items

   1. Alkanes
   2. Alcohols
   3. Alkenes
   4. Alkynes

   Reason

   Alcohols contain oxygen. The other three are hydrocarbon families made of carbon and hydrogen only.

   Odd item

   Alcohols

3. Items

   1. CnH2n+2
   2. CnH2n
   3. CnH2n+1OH
   4. CnH2n-2

   Reason

   CnH2n+1OH is the alcohol formula. The other three are the alkane, alkene and alkyne general formulas.

   Odd item

   CnH2n+1OH

Instructions

Tap the item that does not belong with the rest.

Explanation