Give the decreasing order of `C-H` bond length in ethane, ethene and ethyne and why?

The C-C bond length in ethane is:

The decreasing order of bond angles in ethane, ethylene, acetylene and benzene is

Ethane, ethene, ethyne, propene

The correct increasing order of carbon-carbon bond lengths in benzene, ethane, ethene, acetylene and graphite is :

The hybridisation in ethane, ethene and Ethyne is

The decreasing order of bond length of C=C in the following compounds is :