I. Which of the following have abond angle of approximately 120 e. correct answe

Question

I. Which of the following have abond angle of approximately 120 e. correct answer What is the hybridization ofthe central atom in BrFs? sp d. spd 3. What is the moleclar shape (not electronic shape of BrFs? b, trigonal pyramid correct answer c. Tshape. d trigonal planar 4. How many unique resonance structures can be drawn for ONO 2 correct answer CHEM IIIo EXAM 3 5. Draw the 3D Lewis structure for HCCHCN What is the VSEPR notation for the "middle" C-atom in the molecule AXE Ax, correct answer 6. Draw the 3D Lewis structure for HzCCHCN What is the approximate C-C-C bond angle in this molecule? 120 correct answer Page 2

Explanation / Answer

1. Bond angle of 120o is ClF3 because it having 1s &2p atomic orbitals involved.

2. The hybridisation of central atom in BrF3 is sp2 because it having 1s & 2p at. orbitals involved.

3. The molecular shape of BrF3 is trigonal planar.

4. Resonance str is represented by individual str. It has no real existance. It exist in imagination only. Double headed arrow represents resonance between 2 resonance str. ONO- having 3 resonance str.

5. Lewis str of H2CCHCN is H2 - C - CH - C = N .carbon & nitrogen having triple bond.It is also represented by electrons. A is the notation VSEPR for middle c atom in the molecule.

6. C-C-C bond angle in the molecule is 109.5o because it having 1s & 3p at.orbitals involved. Four orbitals lie in space.

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