## How do you calculate index of hydrogen deficiency

Degree of Unsaturation aka Index of Hydrogen Deficiency. Degree of unsaturation is typically covered at the start of your organic chemistry course when you learn how to identify constitutional isomers. Yet it amazes me how many advanced orgo students still don’t understand or know this concept at the Orgo 2 level. Index of Hydrogen Deficiency (IHD) — a Way to Get Useful Information from a Molecular Formula. A fairly simple calculation based on the molecular formula of a molecule gives information about the total number of pi bonds and/or rings that are present in the molecule. The formula for the index if hydrogen deficiency (IHD) is where #"C", color(red)("H"), color(blue)("N")# and #color(green)("X")# are the numbers of each atom in the molecular formula. For example, the formula for agelastatin A is #"C"_12"H"_13"BrN"_4"O"_3# The molecule has eight rings and π bonds [8(r+π)]. Degree of unsaturation. Jump to navigation Jump to search. In the analysis of the molecular formula of organic molecules, the degree of unsaturation (also known as the index of hydrogen deficiency (IHD), double bond equivalents, or unsaturation index) is a calculation that determines the total number of rings and π bonds. To find out the deficiency what you do is multiply the number of carbons by 2 then add 2 then subtract this number from the number of hydrogens. So 22-16=6. You divide this number 2 to get the degree of unsaturatedness. So the number would be 3. classically index of hydrogen deficiency is just for hydrocarbons but whatever source they're quoting is using SODAR and calling it "index". all the same thing. i just wanted to make sure folks learned the more general one so they didn't waste time.

## The Index of Hydrogen Deficiency (or IHD) is also known as "units of unsaturation" and several other similar names. The index of hydrogen deficiency is a count of h ow many molecules of H 2 need to be added to a structure in order to obtain the corresponding saturated, acyclic species.

Degrees of unsaturation is easily calculated by using the IHD formula below. The IHD tells you how many double bonds / rings are present. Very handy! 4 Nov 2017 Calculate double bond equivalents (DBE) or hydrogen deficiency (Z) for a molecular formula. Finding the index of Hydrogen Deficiency (IHD). CnH2n+2 →Non-cyclic alkanes & saturated eg. C6H14. CnH2n. → a double bond ( C=C) or ring eg. C6H6. 27 May 2017 By calculating the index of hydrogen de?ciency (IHD), we can tell from the molecular formula whether and how many multiple bonds and rings See http://www.chemicalforums.com/index.php?topic=36152.0 for calculating probabilities. (STEP 4) Calculate Index of Hydrogen Deficiency (IHD). Calculate 29 Sep 2006 (5 points) Calculate the Index of Hydrogen Deficiency (IHD) of this unknown compound. Circle your final answer. e. (10 points) Draw the structure

### classically index of hydrogen deficiency is just for hydrocarbons but whatever source they're quoting is using SODAR and calling it "index". all the same thing. i just wanted to make sure folks learned the more general one so they didn't waste time.

Hydrogen Deficiency Index (HDI) or. Degree of Unsaturation (DU) So, is there a way to calculate the HDI from the molecular formula alone? There sure is! Index of Hydrogen Deficiency is an expression that is used to identify the total number of rings and double bonds present in a given compound. It helps in the The IHD (Index of Hydrogen Deficiency) is the number of double bonds plus rings in the molecule. For C13H16O2, for instance, the IHD = 6. There are other The Index of Hydrogen Deficiency (or IHD) is also known as "units of unsaturation" and several other similar names. The index of hydrogen deficiency is a count of h ow many molecules of H 2 need to be added to a structure in order to obtain the corresponding saturated, acyclic species. Compounds Containing Elements Other than C and H. Halogens (F, Cl, Br, I) are treated like H atoms (CH 2 Cl 2 has the same IHD as CH4). For each N, add one to the number of C and one to the number H (CH 5 N is treated as C 2 H 6 . CH 4 N 2 O is treated as C 3 H 6 by adding 2 to

### 4 Nov 2017 Calculate double bond equivalents (DBE) or hydrogen deficiency (Z) for a molecular formula.

Degrees of Unsaturation or Index of Hydrogen Deficiency Saturated and unsaturated compounds In this post, we will talk about saturated and unsaturated compounds , the degresss of unsaturation (or Hydrogen Deficiency Index -HDI ), and the different ways of calculating it. Index of Hydrogen Deficiency (IHD) The Index of Hydrogen Deficiency (IHD), is a count of how many molecules of H 2 need to be added to a structure in order to obtain the corresponding saturated, acyclic species. Hence it takes a count of how many rings and multiple bonds are present in the structure. Index of Hydrogen Deficiency (IHD) (Excerpt from Chem 201 Lab Manual Aug 2005) There is no simple way of predicting how many isomers a given molecular formula will yield, (it can range from one to many). Structures are different if they cannot be superimposed upon one another. So we could write that the hydrogen deficiency index is equal to one-half times what's in the parenthesis. Which is two times the number of carbons plus two. That's the whole two n plus two idea. Minus the number of hydrogens. So let's go ahead and do it for this molecular formula with six carbons and six hydrogens. Same as "degree of unsaturation.” The hydrogen deficiency index is the number of molecules of H2 which would have to be added to the molecule of interest to convert it to a saturated (ie., no pi bonds), acyclic compound. This number is equal to the number of pi bonds plus the number of rings present in the molecule of interest.

## To find out the deficiency what you do is multiply the number of carbons by 2 then add 2 then subtract this number from the number of hydrogens. So 22-16=6. You divide this number 2 to get the degree of unsaturatedness. So the number would be 3.

Calculate the percentage composition (by weight) of the compound. Determine the index of hydrogen deficiency for each of the following compounds: (a) A molecule with 1 degree of unsaturation (hydrogen deficiency index, HDI) could be Calculate the number of hydrogens for the parent alkane, CnH2n +2. 2. 25 Apr 2017 Subtract each nitrogen from a hydrogen. In this example, you can now represent the compound as C6H4. Calculate the unsaturation number Hydrogen Deficiency Index (HDI) or. Degree of Unsaturation (DU) So, is there a way to calculate the HDI from the molecular formula alone? There sure is!

Degrees of unsaturation is easily calculated by using the IHD formula below. The IHD tells you how many double bonds / rings are present. Very handy! 4 Nov 2017 Calculate double bond equivalents (DBE) or hydrogen deficiency (Z) for a molecular formula.