23. We can use a simple formula to find out structural information when provided

Question

23. We can use a simple formula to find out structural information when provided a chemical formula. What we calculate is a value called the index of hydrogen deficiency, or IHD. This is based on the fact that each pi bond or ring, takes away 2 H from a hydrocarbon formula. Here are some problems and the formula. X = halogen, N = nitrogen, oxygens are ignored because they do not have an effect.

IHD = 0.5 * [2C+2-H-X+N]

Write the sum of rings and/or double bonds for the following. (index of hydrogen deficiency, IHD).

Explanation / Answer

C8H8 =2x8+2-8/2= 5(4 for phenyl group and 1 for double bond, it may be styrene

C10H9Br2F =2x9+2+3-9/2=7

C5H10O =2x5+2-10/2=1 it may have one ring or double bond

C3H4N2 =2x3+2-2-4/2= 1, it may have one double bond.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.