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.