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Question

Which of the following is NOT a characteristic of substitution reactions in alkanes?

This question was previously asked in
RRB Group D 2025 Question Paper (18-Aug-2026) (Shift 1)
The correct answer is

Double bond is broken

Substitution reactions of alkanes involve replacing one hydrogen atom of the alkane with another atom or group, most commonly a halogen in the presence of sunlight. The characteristic features are that one atom (usually a halogen) replaces another (a hydrogen), the reaction is initiated by sunlight, and several products can form because different hydrogens can be replaced.

Alkanes are saturated hydrocarbons; they contain only single C–C bonds and have no double bonds to break. Breaking of a double bond is what happens in addition reactions of alkenes and alkynes, not in substitution reactions of alkanes.

Hence, the answer is Double bond is broken.

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Similar Questions

  1. What do methane, ethane and propane represent in the study of carbon compounds?

  2. Which property is most affected if the length of the carbon chain in an alkane increases?

  3. Which among the following molecular formulae of organic compounds does NOT represent a ring structure?

  4. Why do higher homologues of alkanes produce multiple products when they react with chlorine in a substitution reaction?

  5. Select the correct option regarding the following two statements labelled Assertion (A) and Reason (R).

    Assertion (A): Unsaturated hydrocarbons give a yellow flame with black smoke.

    Reason (R): They burn completely when oxygen is insufficient.

  6. Unsaturated hydrocarbons usually undergo which of the following reaction mechanisms?

  7. Which of the following statements about a homologous series are CORRECT?

    (1) All members have the same general formula.

    (2) Each successive member differs by a \(-CH_2-\) group.

    (3) Physical properties remain identical for all members.

  8. Which of the following hydrocarbons undergo addition reactions with hydrogen?

  9. A compound has the molecular formula C4H10. Which statement best describes its structure?

  10. What sort of flame is produced when unsaturated carbon compounds are burnt in air?


Important Questions from Hydrocarbons

  1. Which of the following base is found in soap?

  2. Which one of the following is the general formula of Alkenes?

  3. \({\rm{C}}{{\rm{H}}_3}{\rm{COOH}}\mathop \to \limits^{LiAI{H_4}} {\rm{A}}\mathop \to \limits^{PC{I_5}} {\rm{B}}\mathop \to \limits^{alc.KOH} {\rm{C}}\) Homologue of ‘C’ in the above reaction is:
  4. Maximum quantity of carbon is present in

  5. Which of the following pair gives 1° carbonium ion by hydrolysis of C-Br bond?

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