10th Class Chemistry Chapter 4 (12) Short Questions 2024

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Class 10 Chemistry Chapter 12 Notes

Post TopicShort Questions
Book CodeChemistry
Class9th Class
Chapter/FullChapter 4
BoardPunjab Board

Class 10 Chemistry Chapter 12 Important Short Questions Notes

  • Hydrocarbons are organic compounds of carbon and hydrogen elements. They are alkanes, alkenes, and alkynes.
  • Open-chain hydrocarbons are classified as saturated and unsaturated.
  • Saturated hydrocarbons consist of each carbon atom having its tetravalency fully satisfied by single bonds. They are called alkanes and have a general formula of CnH2n+2.
  • Unsaturated hydrocarbons consist of double and triple bonds. Compounds consisting of double bonds are called alkenes. They have a general formula CnH2n. While compounds consisting of triple bonds are called alkynes. They have the general formula CnH2n-2.
  • Alkanes are named with respect to a number of carbon atoms ending with the suffix ‘ane’.
  • Alkanes are prepared by the hydrogenation of alkenes or alkynes and the reduction of alkyl halides.
  • The important reactions of alkanes are combustion and halogenation. Combustion of alkanes produces a lot of energy which is the reason alkanes are used as fuel.
  • Alkenes are prepared by dehydration of alcohols and dehydrohalogenation of alkyl halides.
  • Alkenes give important reactions like halogenation and oxidation. Oxidation of alkene produces an important compound, glycol.
  • Alkynes are prepared by the dehydrohalogenation of vicinal dihalides and dehalogenation of tetrahalides.
  • An important reaction of acetylene is oxidation which produces oxalic acid.

Short Questions

  • Differentiate between saturated and unsaturated hydrocarbons.
  • A compound consisting of four carbon atoms has a triple bond in it. How many hydrogen atoms are present in it?
  • Why are the alkanes called ‘paraffins’?
  • What do you know about the hydrogenation of alkenes?
  • How are alkyl halides reduced?
  • Why are the alkanes used as fuel?
  • How can you prepare ethene from alcohol and ethyl bromide?
  • Identify propane from propene with a chemical test.
  • Why are the alkenes called ‘olefins’?
  • Why alkane can’t be oxidized with KMnO4 solution?
  • What are the addition reactions? Explain with an example.
  • Justify that alkanes give substitution reactions.
  • Both alkenes and alkynes are unsaturated hydrocarbons. State the one most significant difference between them.
  • Write the molecular, dot cross, and structural formula of ethyne.
  • Why are hydrocarbons soluble in organic solvents?
  • Give the physical properties of alkanes.
  • How can you identify ethane from ethene?
  • Why color of bromine water discharge with the addition of ethene it?
  • State one important use of each: (i) Ethene (ii) Acetylene (iii) Chloroform (iv) Carbon tetrachloride
Chemistry Questions
Chemistry Chapter 4 Short Questions


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