Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 20: Q9P. (page 1055)

Question: Draw all four resonance forms of the fragment at m/z 73 in the mass spectrum of pentanoic acid.

Short Answer

Expert verified

Answer

The four resonance forms of the fragment at m/z 73 in pentanoic acid are shown:

Four resonance forms of pentanoic acid have fragments at m/z 73

Step by step solution

01

Mass spectrum

The mass spectrum is the representation in the form of a graph where the ratio of mass to charge is given and used to measure the mass when a molecular is converted into a gas phase ion. The fragments of the molecules are radical cations.

02

Resonance forms of the fragment at m/z 73 in pentanoic acid

The molecular weight of pentanoic acid is 102.13 g/mol. The fragment cleaved from pentanoic acid is -CH2CH3. It has a molecular mass of 29. The four resonance forms of the fragment at m/z 73 in pentanoic acid are shown as follows:

Four resonance forms of pentanoic acid have fragments at m/z 73

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Show how you would use extractions with a separatory funnel to separate a mixture of the following compounds: benzoic acid, phenol, benzyl alcohol, aniline.

Question: Convert the following infrared wavenumbers into wavelengths.

(a) 1600 cm-1, typical for an aromatic

(b) 3000 cm-1 , typical for a saturated C-H bond

(c) 1715 cm-1 , typical for a ketone carbonyl

(d) 1750cm-1 , typical for an ester carbonyl

(e)2200cm-1 , typical for a nitrile

(f) 3300cm-1 , typical for an alcohol O-H.

In each case, show how you would synthesize the chloride, bromide, and iodide from the corresponding alcohol.

(a) 1-halopropane (halo = chloro, bromo, iodo)

(b)1-halo-2-methylcyclopentane

(c)1-halo-1,3-dimethylcyclohexane

(d)2-halo-1,3-dimethylcyclohexane

Given the structure of ascorbic acid (vitamin C):

(a) Is ascorbic acid a carboxylic acid?

(b) Compare the acid strength of ascorbic acid (pKa=4.71) with acetic acid.

(c) Predict which proton in ascorbic acid is the most acidic.

(d) Draw the form of ascorbic acid that is present in the body (aqueous solution, pH = 7.4).

Tributylin hydride (Bu3SnH)is used synthetically to reduce alkyl halides, replacing a halogen atom with hydrogen. Free-radical initiators promote this reaction, and free-radical inhibitors are known to slow or stop it. You job is to develop a mechanism, using the following reaction as an example.

The following bond-dissociation enthalpies may be helpful:

(a) Propose initiation and propagation steps to account for this reaction.

(b) Calculate values of ΔH for your proposed steps to show that they are energetically feasible. (Hint: A trace of Br2 and light suggests it’s there only as an initiator, to create Brradicals. Then decide which atom can be extracted most favorably from the starting materials by the Brradical. That should complete the initiation. Finally, decide what energetically favored propagation steps will accomplish the reaction).
See all solutions

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Read Explanation

Chemistry Branches

Read Explanation

Chemical Reactions

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Inorganic Chemistry

Read Explanation

Kinetics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free