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Indian Navy SSR Hydrocarbons — practice questions

Explore 31 free Hydrocarbons questions in Indian Navy SSR Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Hydrocarbons questions and exercises with answers

Showing questions 1–30 of 31.

In the presence of organic peroxides, addition of HBr to propene gives predominantly:Read the answer and worked solution →As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is best described as which?Read the answer and worked solution →As per your syllabus, the carbon-carbon triple bond in ethyne (HC≡CH) consists of which σ/π combination?Read the answer and worked solution →As per your syllabus, which of the following groups is a META-directing substituent on benzene?Read the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →Flip and pair: parameter with what it measuresRead the answer and worked solution →Alkane, alkene or alkyne?Read the answer and worked solution →Key in the hydrogen countRead the answer and worked solution →

Worked practice questions

In the presence of organic peroxides, addition of HBr to propene gives predominantly:

  1. 1-bromopropane (anti-Markovnikov)
  2. propan-1-ol
  3. 2-bromopropane (Markovnikov)
  4. propane
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Correct answer: A. 1-bromopropane (anti-Markovnikov)

Kharasch peroxide effect: HBr in the presence of organic peroxides (e.g. benzoyl peroxide) adds **anti-Markovnikov** via a free-radical mechanism. Br ends up on the **less** substituted carbon. Product: 1-bromopropane. Why: the radical chain involves a Br• radical adding to the alkene first. Br• prefers the less-substituted carbon, forming the more stable carbon radical. Then HBr donates H• to complete the addition. Notably, the peroxide effect is **specific to HBr**. HCl and HI don't show it.

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As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is best described as which?

  1. Heterolysis of C-H bond
  2. Markovnikov addition
  3. Homolysis of Cl-Cl bond
  4. Wurtz coupling
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Correct answer: C. Homolysis of Cl-Cl bond

syllabus Mechanism (i): Cl-Cl homolysis under hν gives two Cl• free radicals. Free-radical chain mechanism.

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As per your syllabus, the carbon-carbon triple bond in ethyne (HC≡CH) consists of which σ/π combination?

  1. 1 σ + 2 π
  2. 3 σ
  3. 2 σ + 1 π
  4. 1 σ + 1 π
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Correct answer: A. 1 σ + 2 π

Your syllabus: C≡C = 1 σ (sp-sp axial) + 2 π (two perpendicular p-orbital pairs). Carbons sp hybridised, linear.

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More Chemistry topics

Organic ChemistryAlkenesAlcohols Phenols EthersPolymersChemical Equilibriump-Block ElementsThe p-Block ElementsAtoms and Molecules