NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

Give reasons for the following:

(i) ${\left(C{H}_{3}\right)}_{3}P=O$ exists but ${\left(C{H}_{3}\right)}_{3}N=O$ does not.

(ii) Oxygen has less electron gain enthalpy with negative sign than sulphur.

(iii) ${H}_{3}P{O}_{2}$ is a stronger reducing agent than ${H}_{3}P{O}_{3}.$

(i) ${\left(C{H}_{3}\right)}_{3}P=O$ exists due to presence of empty d-orbitals and thus can expand its covalency upto 6 but ${\left(C{H}_{3}\right)}_{3}N=O$ cannot expand its covalency due to absence of d-orbitals.

(ii) The least negative electron gains enthalpy of oxygen is due to small size and more interelectronic repulsion with coming electron.

(iii) ${H}_{3}P{O}_{2}$ contains two P-H bonds while ${H}_{3}P{O}_{3}$ contains only one P-H bond therefore ${H}_{3}P{O}_{2}$ is a stronger reducing agent.

Difficulty Level:

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