Draw the structures of the isomers for bromobutane.

There are four structural isomers of bromobutane. Out of the four isomers, two are straight-chain isomers and two are branched-chain isomers. Isomers are defined as compounds that have the same molecular formula but different structural formulae.

Write the names of the following compounds: (i) CH 3 - CH 2 - Br (ii)

(i) The IUPAC name of CH 3 - CH 2 - Br is Bromoethane. It is commonly known as ethyl bromide, It contains the haloalkane functional group. (ii) The IUPAC name of is Methanal. It is commonly known as formaldehyde. It contains the aldehyde functional group.

What happens when ethanol is heated with alkaline KMnO 4 or acidified K 2 Cr 2 O 7 ? Write the chemical equation for the reaction.

When ethanol is heated with alkaline KMnO 4 or acidified K 2 Cr 2 O 7 , an oxidation reaction takes place. Oxidation reaction involves the addition of oxygen and removal of hydrogen. Ethanol is oxidised to ethanoic acid in this reaction. The chemical equation is as follows: CH 3 CH 2 OH Ethanol → or Acidified K 2 Cr 2 O 7 + heat Alk . KMnO 4 + heat CH 3 COOH Ethanoic acid Here, KMnO 4 and K 2 Cr 2 O 7 are the oxidising agents in the reaction.

Why is the conversion of ethanol to ethanoic acid an oxidation reaction?

Oxidation reaction involves the addition of oxygen and removal of hydrogen. The conversion of ethanol to ethanoic acid is an oxidation reaction because oxygen is added to ethanol and hydrogen is removed from it to convert it to ethanoic acid. The chemical equation is as follows: CH 3 CH 2 OH Ethanol → or Acidified K 2 Cr 2 O 7 + heat Alk . KMnO 4 + heat CH 3 COOH Ethanoic acid Here, KMnO 4 and K 2 Cr 2 O 7 provides oxygen to ethanol. So, they are the oxidising agents for the above reaction.