7 public questions tagged with this topic.
Reactivity in free radical halogenation decreases with bond strength: F₂ > Cl₂ > Br₂ > I₂ .
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Nucleophilic Substitution Reactions - SN1 and SN2 Mechanisms
Group 17 elements (halogens) have 7 valence electrons, with outer configuration ns² np⁵.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Ionic radius increases down group 17. Among F⁻, Cl⁻, Br⁻, and I⁻, I⁻ (from I, period 5) has the largest radius.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Electron gain enthalpy becomes less negative down group 17 due to increasing size. Order: Cl (most negative) > F > Br.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Electron affinity decreases down group 17 due to increasing size and reduced nuclear attraction. I (period 5) has the lowest value among F, Cl, Br, and I.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Boiling point increases down group 17 due to stronger London dispersion forces with larger size. I (period 5) has the highest boiling point among F, Cl, Br, and I.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
Reactivity with hydrogen decreases down group 17 as H-X bond strength weakens. F forms the strongest H-F bond, making HF the least reactive among HF, HCl, HBr, and HI.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
