What order or C-H bond lengths do you expect in C_(2) H_(6), C_(2) H_(4) and C_(2) H_(2) and why ?

What order or C-H bond lengths do you expect in C_(2) H_(6), C_(2) H_(

1.	What order or C-H bond lengths do you expect in C_(2) H_(6), C_(2) H_(4) and C_(2) H_(2) and why ?
Answer» Solution :` C - H (C_(2) H_(6)) GTC - H (C_(2) H_(4)) gt C - H(C_(2) H_(2)) ` . This is because hybridorbrid ordbitals of carbon involved in overlapping with 1s ORBITAL of hydrogen are `SP^(3) gt sp^(2) gt sp` and ap respecitvely and their sizes are in the order ` sp^(3) gt sp^(2) gt sp ` .