Which of the following represents the correct increasing order of calorific value of the given fuels?

The calorific values of cow dung coke, coal, and Biogas:

6000-8000 KJ/kg

25000-33000 KJ/kg and

35000-40000 KJ/kg respectively.

LPG has 55000 KJ/kg calorific values and

Hydrogen has 1,50,000 KJ/kg calorific value.

So, the increasing order of calorific values is Cow dung cake < Coal < Biogas < LPG < Hydrogen.