Why are carbon and its compounds used as fuels for most applications?

(i) What is vinegar ? Give its uses. (ii) Why does carbon form compounds having low melting and boiling points ?

Describe the addition reaction of carbon compounds with its application. State the functions of catalyst in this reaction. How this reaction is different from a substitution reaction? Explain with example.

Describe the additon reaction of carbon compounds with its application. State the function of catalyst in this reaction. How this reaction is different from a substitution reaction?

Define PCR. Mention its application.

What is the disadvantage of lead in petrol which is used as a fuel in modern automobiles?

List two reasons for carbon forming a large number of compounds. Name the type of bonding found in most of its compounds. Why does carbon form compounds mainly by this kind of bonding. Give reason why the carbon compounds: (i) Generally have low melting and boiling points. (ii) Do not conduct electricity in molten state.

State the reason why carbon forms a covalent compound and not C^(4+) and C^(-4) . Also give reasons why covalent compounds are bad conductors of electricity and have law melting and low boiling points.