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Compounds of Pnictogens-Trends

Why does R 3 ...

Question

Why does R₃P=O exist but R₃N=O does not (R = alkyl group)?

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Solution

N (unlike P) lacks the d-orbital. This restricts nitrogen to expand its coordination number beyond four. Hence, R₃N=O does not exist.

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Q. Give reasons for the following:

R_{3} P = O

R_{3} N = O

R

is an alkyl group?

Q. Give reasons for the following :
(i) Where R is an alkyl group,

R_{3} P = O

R_{3} N = O

P b C l_{4}

is more covalent than

P b C l_{2} .

(iii) At room temperature,

N_{2}

is not very reactive.

Q. Given reasons for the following:
(i) When R is an alkyl group,

R_{3} P = O

R_{3} N = O

P b C l_{4}

is more covalent than

P b C l_{2}

N_{2}

is much less reactive at room temperature.

Q. Assertion :R

_{3}

P = O exists but R

_{3}

N = O does not exist. Reason: P is more electronegative than N.

(C H_{3})_{3} P = O

(C H_{3})_{3} N = O

does not. Give reasons.

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