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JEE Main levelSingle correct optionDifficulty 2 of 3pb082

Assertion (A): is readily hydrolysed by water whereas is not. Reason (R): Silicon has vacant orbitals that can accept a lone pair from water, but carbon has none.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

occurs readily, but is inert to water, so A is true. Carbon in period 2 cannot expand its octet, while silicon can accept the lone pair of water into a orbital (the standard explanation). So R is true and explains A.
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