Answer :
4 single bond , 2 double bond , 2 single bond and 1 double bond , 1 triple bond and 1 single bond are the combinations of single and double covalent bonds result in the appropriate number of bonds around a single carbon atom .
The ground state electronic configuration of C atom : [tex]1s^{2} 2s^{2} 2p^{2}[/tex]. In excited state, one electron from 2s orbital is promoted to 2pz orbital. So, electronic configuration of C in excited state becomes [tex]1s^{2} 2s^{1} 2px^{1} 2py^{1} 2pz^{1}[/tex], Thus, in excited state C has four unpaired electrons in its outermost shell. So, it can form maximum four covalent bonds with other elements. Example: [tex]CH_{4}[/tex] , O=C=O, [tex]CCl_{4}[/tex] , [tex]CHCl_{3}[/tex] etc.
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