CH$$ \equiv $$CH > CH₃ $$-$$C$$ \equiv $$CH
                    > CH₂ $$=$$ CH₂ > CH₃$$-$$CH₃

CH $$ \equiv $$ CH > CH₂ $$=$$ CH₂
                    > CH₃$$-$$C $$ \equiv $$ CH > CH₃ $$-$$CH₃

CH₃$$-$$CH₃ > CH₂ $$=$$ CH₂
                    > CH₃ $$-$$C $$ \equiv $$ CH > CH$$ \equiv $$CH

CH₂$$=$$CH₂ > CH₃ $$-$$ CH $$=$$ CH₂
                    > CH₃ $$-$$ C$$ \equiv $$ CH > CH $$ \equiv $$ CH

Bond angle changes but bond length remains same.

Both bond angle and bond length change.

Both bond angle and bond length remain same.

Bond angle remains same but bond length changes.

C₃H₆

C₂H₂

C₄H₁₀

C₂H₄