Given an organic formula, how do you assess the number of double bonds in an organic molecule?

Answer 1

We assess the degree of unsaturation.

An unsaturated organic compound has formula #C_nH_(2n+2)#. Each degree of unsaturation REDUCES the hydrogen count by 2, and corresponds to a RING JUNCTION or an olefinic bond. When oxygen appears in the formula, we assess the degree of unsaturation directly (and of course a degree of unsaturation could correspond to #C=O#). Halogens count for #1*H#; we subtract #NH# from the formula if nitrogen is present.
And thus #HC-=CH# has 2 degrees of unsaturation, it is an alkyne.
And #H_3C-CH_3# has 0 degrees of unsaturation.....an alkane.
And #H_2C=CH_2# has 1 degree of unsaturation.....an olefin, or alkene.
And #H_3C-CH_2NH_2-=C_2H_6#...no degrees of unsaturation.
And #C_3H_6# has 1 degrees of unsaturation.....an alkene, i.e. #H_3C-CH-CH_2# OR #"cyclopropane"#.
And #C_3H_8# has 0 degrees of unsaturation.....an alkane.
Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer 2

To assess the number of double bonds in an organic molecule, you count the number of pairs of adjacent carbon atoms that are connected by a double bond. Each double bond consists of two carbon atoms sharing four electrons (two from each atom).

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Not the question you need?

Drag image here or click to upload

Or press Ctrl + V to paste
Answer Background
HIX Tutor
Solve ANY homework problem with a smart AI
  • 98% accuracy study help
  • Covers math, physics, chemistry, biology, and more
  • Step-by-step, in-depth guides
  • Readily available 24/7