8) The molecule benzene (C6H6) can be described by the resonance structures and hybrid shown in Figure 4. Select the true statement(s) regarding the electron distribution in this organic molecule. C. H. H H. H. Figure 4: Resonance Structures of benzene (left) and resonance hybrid of benzene (right) i. The actual structure of C6H6 switches back and forth between the two resonance structures. The resonance structure on the left has a different structure on the right. Each C-C bond is somewhere between a single bond and a double bond. iv. ii. bridization on C than the iii. The C-C bonds in C6H6 are of equal length, and the electronic distribution in the C-C bonds is identical. a) (i) and (ii) b) (i) and (iii) c) (iii) and (iv) d) (ii) and (iv) 510 M
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
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In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
8. Question shown in photo
The molecule benzene (C6H6) can be described by the resonance structures and hybrid shown in Figure 4. Select the true statement(s) regarding the electron distribution in this organic molecule.
i. The actual structure of C6H6 switches back and forth between the two resonance structures.
ii. The resonance structure on the left has a different hybridization on C than the structure on the right.
iii. Each C-C bond is somewhere between a single bond and a double bond.
iv. The C-C bonds in C6H6 are of equal length, and the electronic distribution in the C-C bonds is identical.
Choices:
a) (i) and (ii)
b) (i) and (iii)
c) (iii) and (iv)
d) (ii) and (iv)
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