CHEM 102 Lecture Notes - Lecture 11: Dimethyl Ether, Tetrahydrofuran, Chemical Formula

27 views2 pages

amethystserval28

21 Feb 2017

School

Binghamton University

Department

Chemistry

Course

CHEM 102

Professor

Samwel Cheruiyot

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Isomerism for ethers: ethers have carbon chains (two alkyl groups), and therefore constitutional isomerism possibilities in ethers depend on. The partitioning of carbon atoms between the two alkyl groups and. Isomerism possibilities for the individual alkyl groups present. Isomerism is not possible for a c2 or c3 ether: c4 and c5 ethers exhibit constitutional isomers, functional group isomerism. Ethers and alcohols with the same number of carbon atoms and the same degree of saturation have the same molecular formula. Example: dimethyl ether and ethyl alcohol both have the molecular formula. Functional group isomers are constitutional isomers that contain different functional groups. C3 ether-alcohol function group isomerism possibilities are limited to three. Physical and chemical properties of ethers: physical properties. The boiling points of ethers are similar to those of alkanes of comparable molecular mass and are much lower than those of alcohols of comparable mass.

Related Questions

Classify each of the following statements as true or false:

a) To be classified as organic, a compound must be or have been part of a living organism.

b) Carbon atoms normally form four bonds in organic compounds.

c) Only an unsaturated hydrocarbon can engage in an addition reaction.

d) Members of a homologous series differ by a distinct structural unit.

e) Alkanes, alkenes, and alkynes are unsaturated hydrocarbons.

f) Alkyl groups are a class of organic compounds.

g) Isomers have the same molecular formulas but different structural formulas.

h) Cis-trans isomerism appear among alkenes but not alkynes.

i) All aliphatic hydrocarbons are unsaturated.

j) Aromatic hydrocarbons have a ring structure.

k) An alcohol has an alkyl group bonded to an oxygen atom, and an ether has two.

l) Carbonyl groups are found in alcohols and aldehydes.

m) An ester is an aromatic carbon made from the reaction of an alcohol and a carboxylic acid.

n) An amine has one, two, or three alkyl groups substituted for hydrogens in an ammonia molecule.

o) An amide has the structure of a carboxylic acid except that replaces OH in the carboxyl group.

p) A peptide linkage series arises when a water molecule forms from a hydrogen from the of one amino acid molecule an from an another amino acid molecule.

r) Chain-growth polymers are made a reaction that gives off water a second product.

s) Nylon is an example of a step-growth condensation polymer.

sangriacicada137

1.Structural isomer refers to organic compound that have the same molecular formula but different structure (bonding pattern is different). This problem is designed to guide you to explore structure isomer.

(a)Go ahead and write Lewis structure for butane (C₄H₁₀). You may draw four C atoms connect straight as like in train.

(b)In the above structure, four C atoms are connected straight in a line. If you move one C atom to the side (like 3 C atoms in a line, one connected to the middle C atom), after you supply all the H atoms to make all the C atoms saturated with 4-bonds each. Will the molecular formula for your structure drawn be different from butane?

( c) Structures you obtained in (a) and (b) are an example of structural isomers. What kind of name we can give to structure in (b) so we can differentiate it from structure in (a)?

2.Alkane is the basic building block of organic compound. We often write alkane chain as a group R. On this basic chain, we can add different functional group, like âOH for alcohol, -COOH for carboxylic acid.

(a)Methanol refers to CH₃OH. Ethanol refers to CH₃CH₂OH. Draw the Lewis structure for these two compounds.

(b) If you have a straight alkane chain, where does âOH group can be attached? How do you name it so you can know where âOH group is attached?

3. Give the Lewis structure for CH₃COOH. Give its systematic name and common name.

4. Ester refers to two alkane chains connected through a single O atom. Write the Lewis structure for this simplest kind of ester: CH₃OCH₃. Find its name and some common use.

5. Benzene molecular formula is C₆H₆. The six carbon atoms are connected to form a ring (hexagon). Draw the Lewis structure for C₆H₆. Do you think the six bond lengths between C-C atoms should be same or not according to your drawn Lewis structure?

CHEM 102 Lecture Notes - Lecture 11: Dimethyl Ether, Tetrahydrofuran, Chemical Formula

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 102 Lecture Notes - Lecture 19: Ethylamine, Ionic Compound, Methyl Group

CHEM 102 Lecture Notes - Lecture 17: Phosphorus Pentachloride, Phosphorus Trichloride, Polyethylene Terephthalate

CHEM 102 Lecture Notes - Lecture 5: Chemical Formula, Structural Formula, Alkene

Related Questions