valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???

The valency of any element never changes. In CH4 and C2H6, carbon forms single bonds. In C2H4, carbon forms 1 double bond ( it shares 2 electrons). In C2H2, carbon forms 1 triple bond ( it shares 3 electrons).

You will study this in Chapter 4 in class X. I hope this cleared your doubts.

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