Unsaturated hydrocarbons contain multiple bonds between the two C-atoms and show addition reactions. Give the test to distinguish ethane from ethene.
Saturated hydrocarbons generally burn with a clean flame. So, when ethane is burnt, it burns with a clean flame and no soot is produced.
Unsaturated hydrocarbons burn with a yellow flame and produce a lot of soot. When ethene is burnt, it burns with a yellow flame and produces a lot of soot.
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- The unsaturated hydrocarbons which contain one or more double bonds are called ____________.
- Mention two differences between saturated and unsaturated hydrocarbons.
- Unsaturated Hydrocarbons
- (a) What are hydrocarbons? Give examples.(b) Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.(c) What is a functional group? Give examples of four different functional groups.
- Which of the following hydrocarbons undergo addition reactions :C2H6, C3H8, C3H6, C2H2, and CH4
- In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formula.
- Addition reactions are undergone by saturated hydrocarbons (alkanes)only alkenesonly alkynesboth alkenes and alkynes
- You are given the following molecular formulae of some hydrocarbons:C5H8 ; C7H14 ; C6H6 ; C5H10 ; C7H12 ; C6H12 (a) Which formula represents cyclohexane as well as hexane? (b) Which formula represents benzene? (c) Which three formulae represent open chain unsaturated hydrocarbons having double bonds? (d) Which two formulae represent unsaturated hydrocarbons having triple bonds? (e) Which three formulae can represent cyclic hydrocarbons?
- Which of the following hydrocarbons is unsaturated?C3H4 ; C2H6
- Write the electron-dot structures for:(i) ethane, (ii) ethene and (iii) ethyne.
- Which of the following hydrocarbons will give substitution reactions and why?CH4, C3H6, C3H8, C4H6, C5H12, C5H10
- Ethane with molecular formula C2H6 has(a) 6 covalent bonds(b) 7 covalent bonds(c) 8 covalent bonds(d) 9 covalent bonds.
- Ethane, with the molecular formula C2H6, has(a) 6 covalent bonds
- The reaction in which a reagent (partially or completely) replaces atom or group of atoms from saturated compounds or A are called B reaction.Here, A and B respectively refer to(a) unsaturated compounds, addition(b) unsaturated compounds, substitution(c) benzene, substitution(d) alkene, addition.
- Explain why, ethene decolourises bromine water whereas ethane does not.
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