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a
an unexcited carbon atom has two unpaired electrons
b
the C-atom has four valence electrons
c
the C-atom can be an acceptor of an electron pair
d
the maximum covalency of carbon is three
answer is C.
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Detailed Solution
In structure I, octet of oxygen is complete but octet of carbon is incomplete. Hence, carbon is an acceptor of an electron pair from oxygen. Thus, covalency of carbon is three in CO.