Why bond dissociation energy of each bond in.methane is different?
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Removal of hydrogen atoms takes place sequentially. When the first is removed, the sp3 carbon-hydrogen bond is broken, after which the carbon is sp2. During the removal of the second hydrogen, the sp2 carbon-hydrogen bond is broken and so on. Since sp carbon is the most electronegative amongst different hybridised carbon atoms and sp3 carbon is the least, the last carbon hydrogen bond(unhybridised carbon hydrogen bond) has the highest bond dissociation enthalpy while the first has the least.
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Removal of hydrogen atoms takes place sequentially. When the first is removed, the sp3 carbon-hydrogen bond is broken, after which the carbon is sp2. During the removal of the second hydrogen, the sp2 carbon-hydrogen bond is broken and so on. Since sp carbon is the most electronegative amongst different hybridised carbon atoms and sp3 carbon is the least, the last carbon hydrogen bond(unhybridised carbon hydrogen bond) has the highest bond dissociation enthalpy while the first has the least.
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