An organic acid on cooling below 16.5°C crystallises out in the pure form, forming a crystalline mass resembling ice. Draw the structural diagram of this carboxylic acid.

Magnesium ribbon is added to dilute HCl. A gas is liberated along with the formation of a compound. Draw an electron dot diagram to show the structure of the compound that is formed.

Draw the chain Isomer for the following organic compound.

Calcium hydroxide dissolves in water and forms a ion and a negative ion. Draw the structure of the negative ion.