A certain hydrocarbon has a molecular formula of C_{5}H_{8} . Which of the following is *not* a structural possibility for this hydrocarbon?

(a) It is a cycloalkane.

(b) It contains one ring and one double bond.

(c) It contains two double bonds and no rings.

(d) It is an alkyne.

How many degrees of unsaturation does the following compound have?

A) 4

B) 5

C) 6

D) 7

E) 8

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What is the index of hydrogen deficiency of each? (Hint: Think about their MF's)

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Which of the following compounds have the same degree of unsaturation?

a.I & II

b.I & III

c.III & IV

d.II & III

e.I & IV

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In each pair below, circle the compound with the largest index of hydrogen deficiency; circle both if the index of hydrogen deficiency is the same.

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Calculate the IHD, index of hydrogen deficiency, for a compound of molecular formula C_{12}H_{18}N_{3}F_{2}ClNO_{3}.

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Calculate the IHD, index of hydrogen deficiency, for a compound of molecular formula C_{5}H_{9}O_{2}Br.

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What is the index of hydrogen deficiency of each of the following molecules?

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What is the __unsaturation number__ of limonene?

A. 0

B. 1

C. 2

D. 3

E. 4

F. 5

G. 6

H. 7

I. 8

J. 9

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An acyclic alkane has 20 hydrogen atoms. How many carbon atoms are present in this molecule? (A molecule is acyclic if its structure contains no rings.)

A. 6 B. 7 C. 8 D. 9 E. 10

F. 11 G. 12 H. 13 I. 14 J. None of these

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Calculate the degree of unsaturation for C_{6}H_{10}S_{.}

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Determine the molecular formula corresponding to the following structure. Calculate the number of degrees of unsaturation from the molecular formula and evaluate whether your calculations agree with the structure shown.

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Determine the molecular formula corresponding to the following structure. Calculate the number of degrees of unsaturation from the molecular formula and evaluate whether your calculations agree with the structure shown.

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Determine the degree of unsaturation of the following formulas.

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Determine the index of hydrogen deficiency (degrees of unsaturation) for the following molecule

Cancer, a tyrosine kinase inhibitor - Bosutinib

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Determine the index of hydrogen deficiency (degrees of unsaturation) for the following molecule.

Antipsychotic - Haloperidol = C_{21}H_{23}NO_{2}ClF

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