Show which bonds are broken and which bonds are formed during the following reaction. Also, indicate whether each of these bonds is a σ bond or a π bond.

• A. Broken: O—H σ bond of the alcohol and Si—Cl σ bond of the silyl ether
  Formed: O—Si σ bond of the chlorotrimethylsilane and H—N σ bond of the triethylamine
• B. Broken: O—H σ bond of the alcohol and Si—Cl σ bond of the chlorotrimethylsilane
  Formed: O—Si σ bond of the silyl ether and H—N σ bond of the triethylamine
• C. Broken: O—Si σ bond of the silyl ether and H—N σ bond of the triethylamine
  Formed: O—H σ bond of the alcohol and Si—Cl σ bond of the chlorotrimethylsilane
• D. Broken: O—Si σ bond of the chlorotrimethylsilane and H—N σ bond of the triethylamine
  Formed: O—H σ bond of the alcohol and Si—Cl σ bond of the silyl ether

Answer: (B)