Which one does NOT belong?

Exercise and reference answers

Questions

1. Items

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

   Reason

   Ethene has a double bond, so it is an alkene. The other three are alkanes with single bonds only.

   Odd item

   Ethene

2. Items

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

   Reason

   Alcohols contain oxygen. Alkanes, alkenes and alkynes are all hydrocarbons, made of carbon and hydrogen only.

   Odd item

   Alcohols

3. Items

   1. C2H5OH
   2. CH4
   3. C2H6
   4. C3H8

   Reason

   Ethanol carries an oxygen atom, so it is not a hydrocarbon. The rest are alkanes.

   Odd item

   C2H5OH

Instructions

Tap the item that does not belong with the rest.

Explanation