Question

state the valency of carbon atom in alkane

Answer 1

The valency of carbon is 4...

Answer 2

the general formula of alkanes is $C_{n} H_{2n+2}$
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the carbon in alkane will have the valence of 4 as usual as there are 4 electrons in its valence shell

as it is difficult to remove 4 electrons to get octet and also it is difficult to add 4 electrons to make it octet if we try to add or remove 4 electrons the carbon atom will be highly unstable and it requires very high enegry

therefore valency of carbon will be 4 be it alkane alkene or alkyne
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alkanes are saturated hydrocarbons

the carbon atoms are linked by only single bonds

in order to satisfy the valency 4 carbon will from covalent bonds with other atoms