Hydrocarbons Questions And Answers Pdf
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Hydrocarbons MCQs | Question – Paper 1
Question 1. How do you account for the formation of ethane during chlorination of methane? Question 2. Question 3. Question 4. Write IUPAC names of the products obtained by the ozonolysis of the following compounds: i Pentene ii 3, 4-Dimethylheptene iii 2-Ethylbut-l-ene iv 1-Phenylbut-l-ene. Question 5. Write the structure of the products side by side with their oxygen atoms pointing towards each other. Step 2. Question 6.
Question 7. Propanal and pentanene are the ozonolysis products of an alkene. What is the structural formula of the alkene? Question 8. Question 9. Draw the cis- and trans-structures for hexene. Which iosmer will have higher b. Since cis-isomer has higher dipole moment, therefore, it has higher boiling point. Question Why is benzene extra-ordinarily stable though it contains three double bonds?
Answer: The six electrons of the p-orbitals cover all the six carbon atoms, and are said to be delocalized. As a result of delocalization there formed a stronger n-bond and a more stable molecule. What are the necessary conditions for any system to be aromatic? Explain why the following systems are not aromatic?
Answer: Due to the presence of a sp3-hybridized carbon, the system is not planar. It does contain six n-electrons but the system is not fully conjugated since all the six n-electrons do not form a single cyclic electron cloud which surrounds all the atoms of the ring. Therefore, it is not an aromatic compound. It is, therefore, a non-planar system having 8 n-electrons. Therefore, the sequence of reactions should be such that first an o, p-directing group, i.
Thus, ii Here since the two substituents are at p-position w. Therefore, the sequence of reactions is: iii Here since the two substituents are at m-position w. What effect does branching of an alkane chain has on its boiling point?
Addition of HBr to propene yields 2-bromopropane, while in presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism. In the second step, the free radical thus obtained rapidly abstracts a hydrogen atom from HBr to give 1-bromopropane. From the above discussion, it is evident that although both reactions are electrophilic addition reactions but it is due to different order of addition of H and Br atoms which gives different products.
Write down the products ofozonolysis ofl, 2-dimethylbenzene o-xylene. How does the result support Kekule structure of benzene? Ozonolysis of each one of these gives two products as shown below: Thus, in all, three products are formed. Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour. Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?
Consequently, it attracts the electrophiles electron-deficient reagents towards it and repels nucleophiles electron- rich reagents. As a result, benzene undergoes electrophilic substitution reactions easily and nucleophilic substitutions with difficulty. How will you convert the following compounds into benzene? Write structures of all the alkenes which on hydrogeneration give 2-methylbutane.
Higher the electron-density in the benzene ring, more reactive is the compound towards these reactions. Since N02 is a more powerful electron-withdrawing group than Cl, therefore, more the number of nitro groups, less reactive is the compound. Therefore, the maximum electron-density will be in toluene, followed by p-nitrotoluene followed by p-dinitrobenzene.
Out of benzene, m-dinitrobenzene and toluene which will undergo nitration most easily and why? Therefore, maximum electron density will be in toluene, followed by benzene and least in m-dinitrobenzene. Suggest the name of another Lewis acid instead of anhydrous aluminium chloride which can be used during ethylation of benzene. Why is Wurtz reaction not preferred for preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.
Since two alkyl halides can react in three different ways, therefore, a mixture of three alkanes instead of the desired alkane would be formed. What are conformations? What is decarboxylation? Give an example. What do you mean by pyrolysis? This process when applied to alkanes is known as cracking. What happens when ethanol is heated with cone. Convert ethylene to ethane. Give its use. It is used in the conversion of alkynes to alkenes with the help of H 2.
What happens when benzene is treated with excess of Cl 2 in presence of sunlight? Give chemical reaction. Why are alkanes called paraffins? Alkanes due to strong C—C and C—H bonds are relatively chemically inert. Arrange the three isomers of pentane in increasing order of their boiling points. Although benzene is highly unsaturated it does not undergo addition reactions.
Why are Alkenes called olefins? Which is more acidic: ethene or ethyne and why? What is Huckel rule? How will you distinguish between propene and propane? Propene will decolourise both the solutions but propane does not react. How will you distinguish between acetylene and ethylene? What happens when benzene is treated with acetyl chloride in presence of AlCl 3? Which type of isomerism is exhibited by but-l-yne and butyne? What is electrophile in sulphonation?
What are Arenes? Define resonance energy. What is resonance energy of benzene? The resonance energy of benzene is Explain the following with examples: i Wurtz reaction ii Hydrogenation. Discuss the shape of methane and ethane. Since the carbon atom is attached to four other atoms, it uses sp 3 hybrid orbitals to form these bonds. The C—H bond is the result of overlap of an sp 3 hybrid orbital from carbon and s-orbital from hydrogen.
Orbital structure can be shown as. Classify the following compounds into i alkanes ii alkenes iii alkynes iv arenes. What is polymerization? Simple alkenes polymerize to form long chain addition polymers. For example, ethylene gives polyethylene. Draw the structures of cis- and trans-isomers of the following compounds. How will you convert ethanoic acid into ethene? Explain the term aromaticity. What are the necessary conditions for any compound to show aromaticity?
They undergo substitution reactions rather addition reactions. This characteristic behaviour is called Aromatic character or Aromaticity. Conditions for Aromaticity:.
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Hydrocarbon , any of a class of organic chemical compounds composed only of the elements carbon C and hydrogen H. The carbon atoms join together to form the framework of the compound , and the hydrogen atoms attach to them in many different configurations. Hydrocarbons are the principal constituents of petroleum and natural gas. They serve as fuels and lubricants as well as raw materials for the production of plastics , fibres , rubbers , solvents, explosives , and industrial chemicals. A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon C and hydrogen H.
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Which of the following is an alkane? Looking at the chemical formulae of these compounds, which is an alkane? What is the name of the alkane which has the formula C 4 H 10? Alkanes are saturated hydrocarbons.
Make sure that your printout includes all content from the page. If it doesn't, try opening this guide in a different browser and printing from there sometimes Internet Explorer works better, sometimes Chrome, sometimes Firefox, etc. Hydrocarbons are the simplest organic compounds, but they have interesting physiological effects.
Which two of the following statements about alkanes are not correct? Which four of the following statements about alkenes are correct? Ethyne gas may be tested for saturation in the laboratory. Select two positive tests from the following:.
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Их прикосновение было знакомым, но вызывало отвращение. Б нем не чувствовалось грубой силы Грега Хейла, скорее - жестокость отчаяния, внутренняя бездушная решительность. Сьюзан повернулась. Человек, попытавшийся ее удержать, выглядел растерянным и напуганным, такого лица у него она не видела.
Она снова вздохнула. - Постараюсь, Джабба. Поверь мне, постараюсь изо всех сил. ГЛАВА 52 Клуб Колдун располагался на окраине города, в конце автобусного маршрута 27. Похожий скорее на крепость, чем на танцевальное заведение, он со всех сторон был окружен высокими оштукатуренными стенами с вделанными в них битыми пивными бутылками - своего рода примитивной системой безопасности, не дающей возможности проникнуть в клуб незаконно, не оставив на стене изрядной части собственного тела.