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Q.

Carbon cannot expand its valency beyond 4, because

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a

it has only 4 electrons

b

it has only 4 shells

c

it lacks valence p-orbitals

d

it lacks valence d-orbitals

answer is D.

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Detailed Solution

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In carbon, due to absence of d-orbital, only s and p-orbitals are available for bonding, therefore, it can accommodate only four pairs of electrons around it. Thus, it has a maximum covalency of four.

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