Predict the result of the catalytic hydrogention of natural rubber and will the product obtained show syndiotactic, atactic or isotactic behaviour. Concept introduction: Isotactic, syndiotactic, and atactic are the stereochemical forms. The polymer having the (-R) groups on the same side of the macromolecule backbone (zigzag bone) is known as isotactic polymer. An isotactic macromolecule consists of 100% meso diads. Syndiotactic are the macromolecules in which the (-R) groups are arranged in an alternate manner along the long chain of the polymer. Gutta-percha is also an example for Syndiotactic polymer. In atactic form, the substituents are placed in a random manner along the long chain. The important point to note here is that the polymer obtained from the chain-growth polymerization mechanism must have chiral carbons to possess these structures. If the polymer formed does not have chiral carbon then it cannot occur in isotactic, syndiotactic and atactic forms. The catalytic hydrogenation natural rubber requires the breaking of double bond and the addition of hydrogen. The double bond of alkene consists of a sigma (σ) and a pie bond (π). The carbon -carbon pie bond is relatively weak. Therefore, it breaks and hydrogen adds to it. When the hydrogen adds, then the double bonds are replaced with the single bonds. The hydrogenation of double bond releases energy therefore, known as an exothermic reaction. The heat released is called the heat of hydrogenation. The catalyst used for the purpose of hydrogenation can be Ra-Ni (Raney-Nickel), PtO 2 (Platinum oxide), Pd-C (Palladium on carbon) etc. They can be used to enhance the rate of reaction .

Question

ii) Molecular ion peak :the peak corresponding to the intact molecule (with a positive charge) What would the base peak and Molecular ion peaks when isobutane is subjected to Mass spectrometry? Draw the structures and write the molecular weights of the fragments. Circle most stable cation a) tert-butyl cation b) Isopropyl cation c) Ethyl cation. d) Methyl cation 6. What does a loss of 15 represent in Mass spectrum? a fragment of the molecule with a mass of 15 atomic mass units has been lost during the ionization Process 7. Write the isotopes and their % abundance of isotopes of i) Cl

Answer 1

Question

Chapter 31.6, Problem 11P

Interpretation Introduction

Interpretation:

Predict the result of the catalytic hydrogention of natural rubber and will the product obtained show syndiotactic, atactic or isotactic behaviour.

Concept introduction:

Isotactic, syndiotactic, and atactic are the stereochemical forms. The polymer having the (-R) groups on the same side of the macromolecule backbone (zigzag bone) is known as isotactic polymer. An isotactic macromolecule consists of 100% meso diads.

Syndiotactic are the macromolecules in which the (-R) groups are arranged in an alternate manner along the long chain of the polymer. Gutta-percha is also an example for Syndiotactic polymer.

In atactic form, the substituents are placed in a random manner along the long chain.

The important point to note here is that the polymer obtained from the chain-growth polymerization mechanism must have chiral carbons to possess these structures. If the polymer formed does not have chiral carbon then it cannot occur in isotactic, syndiotactic and atactic forms.

The catalytic hydrogenation natural rubber requires the breaking of double bond and the addition of hydrogen. The double bond of alkene consists of a sigma (σ) and a pie bond (π). The carbon -carbon pie bond is relatively weak.

Therefore, it breaks and hydrogen adds to it. When the hydrogen adds, then the double bonds are replaced with the single bonds. The hydrogenation of double bond releases energy therefore, known as an exothermic reaction. The heat released is called the heat of hydrogenation.

The catalyst used for the purpose of hydrogenation can be Ra-Ni (Raney-Nickel), PtO₂ (Platinum oxide), Pd-C (Palladium on carbon) etc. They can be used to enhance the rate of reaction.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

ii) Molecular ion peak :the peak corresponding to the intact molecule (with a positive charge) What would the base peak and Molecular ion peaks when isobutane is subjected to Mass spectrometry? Draw the structures and write the molecular weights of the fragments. Circle most stable cation a) tert-butyl cation b) Isopropyl cation c) Ethyl cation. d) Methyl cation 6. What does a loss of 15 represent in Mass spectrum? a fragment of the molecule with a mass of 15 atomic mass units has been lost during the ionization Process 7. Write the isotopes and their % abundance of isotopes of i) Cl

Choose a number and match the atomic number to your element on the periodic table. For your element, write each of these features on a side of your figure. 1. Element Name and symbol 2. Family and group 3. What is it used for? 4. Sketch the Valence electron orbital 5. What ions formed. What is it's block on the periodic table. 6. Common compounds 7. Atomic number 8. Mass number 9. Number of neutrons- (show calculations) 10. Sketch the spectral display of the element 11.Properties 12. Electron configuration 13. Submit a video of a 3-meter toss in slow-mo

[In this question, there are multiple answers to type in a "fill-in-the-blank" fashion - in each case, type in a whole number.] Consider using Slater's Rules to calculate the shielding factor (S) for the last electron in silicon (Si). There will be electrons with a 0.35 S-multiplier, electrons with a 0.85 S-multiplier, and electrons with a 1.00 S-multiplier.