Chem301 - HW8 - segal(mas6582 H08 MO Theory mccord(50970...

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segal (mas6582) – H08: MO Theory – mccord – (50970) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A sigma bond 1. is always polar. 2. may exist alone or in conjunction with a pi bond. correct 3. always exists in conjunction with a pi bond. 4. is composed of non-bonding orbitals. 5. stems from sp hybridization of orbitals. Explanation: A sigma, or single bond can exist by itself or with a pi bond, forming a double bond. 002 10.0 points In a new compound, it is found that the cen- tral carbon atom is sp 2 hybridized. This implies that 1. carbon has a tetrahedral electronic geom- etry. 2. carbon has four sigma bonds. 3. carbon has four lone pairs of electrons. 4. carbon has four regions of high electron density. 5. carbon is also involved in a pi bond. cor- rect Explanation: Carbon forms four bonds. sp 2 hybridiza- tion enables a C atom to bond to three other atoms, leaving one electron in a p orbital, which will form a pi bond. 003 10.0 points In the molecule, C 2 H 4 , what are the atomic orbitals that participate in forming the sigma bond between the C and H atoms? 1. H: 1 s and C: sp 2. H: sp 2 and C: sp 2 3. H: 2 p and C: sp 3 4. H: 1 s and C: sp 2 correct 5. H: 1 s and C: 2 p Explanation: The electrons in the H 1 s orbital and the electrons in the C sp 2 hybrid orbital partici- pate in forming the bond. 004 (part 1 of 4) 10.0 points Draw the Lewis structure for the following hydrocarbon molecule. The carbons are num- bered one to four starting with the far left carbon as one. CH 2 CCHCH 3 What is the molecular shape of carbon 3? 1. linear 2. trigonal pyramidal 3. tetrahedral 4. trigonal planar correct 5. bipyramidal 6. square planar 7. angular Explanation: The molecule has the structure C C C C Carbon 3 has bonds to two carbons and one hydrogen or RHED = 3. This is trigonal planar molecular geometry.
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