Statement - I : C–H bond length in acetylene is 1.06A0 and that in ethylene is 1.09A°.Statement - II : C–H bond in acetylene is due to sp–s overlapping whereas in ethylene it is due to sp2 – s overlapping.

As the % of s-character increases, spherical shape of hybridised orbital increases, hence closeness of orbital (or e-s) to the nucleus increases, ie., size of hybridised orbital decreases, hence C – H bond length decreases.