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Question

Which of the following compounds have same geometry ammong the following :
(i) H2O (ii) AlCl3 (iii) CH4 (iv) NF3

A
(i),(ii)
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B
(i),(ii),(iv)
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C
(i),(iii),(iv)
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D
(iii),(iv)
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Solution

The correct option is C (i),(iii),(iv)
The compounds having same hybridisation of the central atom will have same geometry though their shape may be different.

(i) In H2O, O atoms has two lone pairs of electrons and two bonds with two hydrogen atoms. Thus it is sp3 hybridised.
(ii) In AlCl3 , Al is bonded to three H atom without any lone pair. Thus it is sp2 hybridised.
(iii) In CH4, C is bonded to four H atoms. Thus it sp3 hybridised.
(iv) In NF3, N atom is bonded to three F atoms and has one lone pair. Thus it is also sp3 hybridised.

Thus H2O, CH4 and NF3 have same geometry which is tetrahedral.

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