Complete the following equations:

(a) CH₃CH₂OH -----PICTURE

(b) CH₃CH₂OH + C₂H₅OH

(a) CH₄ + O₂

(b) CH₄ + Cl₂

(a) The process of burning of a hydrocarbon in the presence of air to give CO₂, H₂0, heat and light is known as ............

(b) The sodium salt of a long chain fatty acid is called .........

(c) ............ is better than soap for washing clothes when the water is hard.

(d) The organic acid present in vinegar is.............