Q.

The decreasing leaving group order of the following compounds is:

i. NH3     ii. PH3     iii. AsH3     iv. SbH3

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a

(i) > (ii) > (iii) > (iv)

b

(ii) > (i) > (iv) > (iii)

c

(ii) > (i) > (iii) > (iv)

d

(iv) > (iii) > (ii) > (i)

answer is B.

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Detailed Solution

Weaker the base or stronger the acid, stronger is the leaving group.

SbH3>AsH3>PH3>NH3

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