Chemistry · Electronic displacement in a covalent bond: Inductive effect, electromeric effect, resonance and hyperconjugation
Correct boiling point is:
Correct boiling point is: \( \begin{array}{cc}\boldsymbol{C H}_{3} \boldsymbol{C H}_{2}-\boldsymbol{I} & \boldsymbol{C H}_{3} \boldsymbol{C H}_{2}-\boldsymbol{B r}\end{array} \) \( \begin{array}{cc}\boldsymbol{C H}_{3} \boldsymbol{C H}_{2}-\boldsymbol{C l} & \boldsymbol{C H}_{3} \boldsymbol{C H}_{2}-\boldsymbol{F}\end{array} \)
- A. \( I V>I I I>I I>I \)
- B. \( I I>I I I>I V>I \)
- C. \( I>I I>I I I>I V \)
- D. \( I V>I I I>I>I I \)
Step-by-step solution
Boiling points of alkyl halides increase with increasing molecular weight and polarizability. Iodine is largest and most polarizable, giving the highest boiling point, followed by bromine, chlorine, and fluorine. Thus order: CH3CH2I (I) > CH3CH2Br (II) > CH3CH2Cl (III) > CH3CH2F (IV).