{
  "id": "2eb7e77a-7342-590c-990a-799b25f7255b",
  "slug": "r3-4-electron-pair-sharing-reactions-hl",
  "title": "R3.4 Electron-pair sharing reactions (HL)",
  "course": "IB Chemistry",
  "level": "HL",
  "syllabusCode": "R3.4",
  "questionCount": 15,
  "page": "https://splycr.com/ib-chemistry/r3-4-electron-pair-sharing-reactions-hl",
  "data": "https://splycr.com/library/r3-4-electron-pair-sharing-reactions-hl.json",
  "play": "https://splycr.com/?set=2eb7e77a-7342-590c-990a-799b25f7255b",
  "section": {
    "name": "Reactivity 3: What are the mechanisms of chemical change?",
    "page": "https://splycr.com/ib-chemistry/mechanisms-of-chemical-change"
  },
  "source": {
    "name": "Biology by Bradford",
    "href": "https://www.biologybybradford.com",
    "note": "Written for the splycr library by Biology by Bradford."
  },
  "questions": [
    {
      "number": 1,
      "question": "Species that accepts an electron pair to form a coordination bond?",
      "answer": "Lewis acid",
      "wrongOptions": [
        "Lewis base",
        "Brønsted–Lowry acid",
        "Nucleophile"
      ]
    },
    {
      "number": 2,
      "question": "Atom that donates the lone pair in BF₃ + NH₃ → F₃B–NH₃?",
      "answer": "Nitrogen",
      "wrongOptions": [
        "Boron",
        "Fluorine",
        "Hydrogen"
      ]
    },
    {
      "number": 3,
      "question": "Bond breaking in which both electrons go to one fragment?",
      "answer": "Heterolytic fission",
      "wrongOptions": [
        "Homolytic fission",
        "Ionisation",
        "Hydrolysis"
      ]
    },
    {
      "number": 4,
      "question": "What a curly arrow shows in a reaction mechanism?",
      "answer": "Electron pair movement",
      "wrongOptions": [
        "Single electron movement",
        "Proton movement",
        "Atom movement"
      ]
    },
    {
      "number": 5,
      "question": "Rate equation for the Sₙ2 reaction of RBr with OH⁻?",
      "answer": "rate = k[RBr][OH⁻]",
      "wrongOptions": [
        "rate = k[RBr]",
        "rate = k[OH⁻]",
        "rate = k[RBr]²"
      ]
    },
    {
      "number": 6,
      "question": "Type of halogenoalkane that reacts mainly by Sₙ1?",
      "answer": "Tertiary",
      "wrongOptions": [
        "Primary",
        "Methyl",
        "Unbranched"
      ]
    },
    {
      "number": 7,
      "question": "Intermediate formed in an Sₙ1 reaction?",
      "answer": "Carbocation",
      "wrongOptions": [
        "Carbanion",
        "Radical",
        "Transition state"
      ]
    },
    {
      "number": 8,
      "question": "Effect of an Sₙ2 reaction on the configuration at a chiral carbon?",
      "answer": "Inversion",
      "wrongOptions": [
        "Retention",
        "Racemisation",
        "No change"
      ]
    },
    {
      "number": 9,
      "question": "Halogenoalkanes react fastest by nucleophilic substitution when the leaving group is…?",
      "answer": "Iodide",
      "wrongOptions": [
        "Fluoride",
        "Chloride",
        "Bromide"
      ]
    },
    {
      "number": 10,
      "question": "In HX addition to an alkene, H joins the carbon already bearing more H atoms: this is…?",
      "answer": "Markovnikov's rule",
      "wrongOptions": [
        "Hund's rule",
        "Zaitsev's rule",
        "Le Chatelier's principle"
      ]
    },
    {
      "number": 11,
      "question": "Major product of propene with HBr?",
      "answer": "2-bromopropane",
      "wrongOptions": [
        "1-bromopropane",
        "1,2-dibromopropane",
        "Bromopropene"
      ]
    },
    {
      "number": 12,
      "question": "Electrophile in the nitration of benzene?",
      "answer": "NO₂⁺",
      "wrongOptions": [
        "NO₃⁻",
        "NO₂⁻",
        "HNO₃"
      ]
    },
    {
      "number": 13,
      "question": "Mixture used to generate the electrophile for nitrating benzene?",
      "answer": "Conc. HNO₃ and H₂SO₄",
      "wrongOptions": [
        "Dilute HNO₃ and HCl",
        "Conc. HCl and H₂SO₄",
        "NaNO₃ and water"
      ]
    },
    {
      "number": 14,
      "question": "Type of reaction between benzene and the nitronium ion?",
      "answer": "Electrophilic substitution",
      "wrongOptions": [
        "Electrophilic addition",
        "Nucleophilic substitution",
        "Free-radical substitution"
      ]
    },
    {
      "number": 15,
      "question": "Benzene favours substitution over addition because addition would disrupt its…?",
      "answer": "Delocalised π electrons",
      "wrongOptions": [
        "Hydrogen atoms",
        "C–H bonds",
        "Planar shape"
      ]
    }
  ]
}