Question

Which one has grater bond length alkanes. alkenes or alkynes and why?

Answer 1

Solution:-

Alkanes has greater bond length.

Hybridization influences bond length. Greater the $s$-character, closer the orbitals are to the nucleus and hence forms shorter bonds.

Since alkanes are $s{p}^3$ hybridised, i.e., it has just $25\%s$-character which is least among all, i.e., alkanes, alkenes and alkynes, therefore it has greater bond length.