General Trends: i)Stretching frequencies are higher than corresponding bending frequencies.(It is easier to bend a bond than to stretch or compress it.) ii)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms. iii)Triple bonds have higher stretching frequencies than corresponding double bonds, which in turn have higher frequencies than single bonds.(Except for bonds to hydrogen)General Trends: i) Stretching frequencies are higher than corresponding bending frequencies. (It is easier to bend a bond than to stretch or compress it.) ii) Bonds to hydrogen have higher stretching frequencies than those to heavier atoms. iii) Triple bonds have higher stretching frequencies than corresponding double bonds, which in turn have higher frequencies than single bonds. (Except for bonds to hydrogen)