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Which of the molecules is/are planar? (1)F2C=C=CF2 (2)F2B-C==C-BF2 (3)(SiH3)3N (4)NH2-NH2
Let us start back wards! 4) NH2-NH2 Here n is sp3 hybridised, hence it is non planar 3) (SiH3)3N Here the lone pair of N has been absorbed by the vacant d- orbital. Hence it is sp2 hybridised and planar. 2) F2B-C=C=C-BF2 BF2-C= is planar and =C-BF2 is also planar. But concentrate on central C atom!. Say it uses x axis for sigma bonds. Then it uses Py and Pz for pi bonds which are inclined at 90*. Hence the 2 triagonal planar structures of BF2C are inclined at 90*. 1)F2C=C=CF2 Same as 2nd.
Let us start back wards!
4) NH2-NH2 Here n is sp3 hybridised, hence it is non planar
3) (SiH3)3N Here the lone pair of N has been absorbed by the vacant d- orbital. Hence it is sp2 hybridised and planar.
2) F2B-C=C=C-BF2
BF2-C= is planar and =C-BF2 is also planar. But concentrate on central C atom!. Say it uses x axis for sigma bonds. Then it uses Py and Pz for pi bonds which are inclined at 90*. Hence the 2 triagonal planar structures of BF2C are inclined at 90*.
1)F2C=C=CF2 Same as 2nd.
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