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Question

Which of the following compounds have the same geometry among the following :
(i) C2H4
(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 options are
A (i),(ii)
D (iii),(iv)
The compounds having the same hybridisation of the central atom will have the same geometry through their shape may be different.

(i) In C2H4, both the C atoms have zero lone pairs of electrons, two bonds with two hydrogen atoms and 1 bond with another carbon. Thus it is sp2 hybridised.

(ii) In AlCl3, Al is bonded to three Cl atoms 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, CH4 and NF3 have the same geometry, which is tetrahedral.

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