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
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
The catalytic hydrogenation natural rubber requires the breaking of double bond and the addition of hydrogen. The double bond of
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
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Chapter 31 Solutions
Organic Chemistry
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- The name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. Suppose you had 300.g of ordinary table sugar, which chemists call sucrose, and which has the chemical formula C12H22O11 . Calculate the maximum mass of water you could theoretically extract. Be sure your answer has a unit symbol, and round it to the correct number of significant digits.arrow_forwardThe name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. Suppose you had (200. g) of ordinary table sugar, which chemists call sucrose, and which has the chemical formula C12H₂2011. Calculate the maximum mass of water you could theoretically extract. Be sure your answer has alunit symbol, and round it to 3 significant digits. 0 HO CH₂OH OH OH OH The actual chemical structure of glucose.arrow_forward21.) Calculate the enthalpy of hydrogenation of benzene to cyclohexane from the following reactions A,H (kJ/mol) C6H6 (1) + 15/2 02 (g) → 6 CO2 (g) + 3 H20 (1) C6H12 (1) + 9 02 (g) → 6 CO2 (g) + 6 H20 (1) H2 (g) + ½ 02 (g) → H2O (1) -3268 -3920 -285.83 a.) -205 kJ/mol b.) -1507 kJ/mol c.) -938 kJ/mol d.) -366 kJ/molarrow_forward
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