Question

Why are carbon compound have low melting and boiling points

Answer 1

because carbon compounds are made of non metals 
compounds made of non metals are called covalent molecular substances 
covalent molecular substances have low melting and a boiling point because they re weak intermolecular  forces between the molecules of the compound and needs only a little Thermal energy to separate their particles

i think this can hlp u out dear =

Answer 2

♤ Carbon can't lose 4 electron to form C^4+ ions as very high energy is required to remove 4 electrons.

♤ Carbon can not gain 4 electron to form C^4- ions as 6 protons can not hold 10 ♤ electrons and Energy needs to be supplied to overcome repulsion.

♤ Carbon can share 4 electron to form covalent compounds.

♤ Carbons do not conduct electricity as they are non - polar and do not form ions.

♤ They have low melting points and boiling points due to weak van der Waal's force of attraction between molecules