Concept explainers
Interpretation: Resonance structures for the formate ion,
Concept Introduction:
Resonating structures are structures that have more than one equivalent Lewis structure for the same molecule or ion.
Resonance structures have existence in paper only, thus, they are not real structures.
According to the convention, these structures are connected by double-headed arrows (
The movement of electrons is represented by curved arrows.
The energy of any contributing structure is higher than the energy of the resonance hybrid.
For equivalent resonating structures, the resonance stabilization is large.
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Organic Chemistry
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- Which statements are true about electronegativity? (a) Electronegativity increases from left to right in a period of the Periodic Table. (b) Electronegativity increases from top to bottom in a column of the Periodic Table . (c) Hydrogen, the element with the lowest atomic number, has the smallest electronegativity. (d) The higher the atomic number of an element, the greater its electronegativity.arrow_forwardDraw a Lewis Structure for each of the following species and assign formal charge where appropriate. Using electronegative values from the period table that was provided identify polar covalent bonds and label the atoms δ+ and δ−. For each of the molecules indicate whether or not it has a dipole moment. (a)CH5N (b) HCN (c) H2CO (d) CH3NC(e) CH3SOCH3 (f) H6BNarrow_forwardConsider compounds A–D, which contain both a heteroatom and a double bond. (a) For which compounds are no additional Lewis structures possible? (b) When two or more Lewis structures can be drawn, draw all additional resonance structures.arrow_forward
- Consider lisinopril, a drug used primarily in the treatment of high blood pressure, heart failure, and after heart attacks. (a) Complete the Lewis structure of lisinopril, showing all valence electrons. (b) Use the valence-shell electron-pair repulsion (VSEPR) model (Section 3.10) to predict all bond angles in lisinopril. (c) Which is the most polar bond in lisinopril? (d) Is lisinopril polar or nonpolar? (e) Is lisinopril expected to possess resonance (Section 3.9)? Explain why or why not. (f) Name the various functional groups in lisinopril. (g) What is the molecular formula of lisinopril? (h) What intermolecular forces are expected to exist between molecules of lisinopril in close proximity to one another (Section 5.7)?arrow_forwardii. Answer true or false. (a) A covalent bond is formed between two atoms whose difference in electronegativity is less than 1.9. (b) If the difference in electronegativity between two atoms is zero (they have identical electronegativities), then the two atoms will not form a covalent bond. (c) A covalent bond formed by sharing two electrons is called a double bond. (d) In the hydrogen molecule (H2), the shared pair of electrons completes the valence shell of each hydrogen. (e) In the molecule CH4, each hydrogen has an electron configuration like that of helium, and carbon has an electron configuration like that of neon. (f) In a polar covalent bond, the more electronegative atom has a partial negative charge (8-) and the less electronegative atom has a partial positive charge (&+). (g) These bonds are arranged in order of increasing polarity C-Harrow_forwardA stable triatomic molecule can be formed that contains one atom each of nitrogen, sulfur, and fluorine. Three bonding structures are possible, depending on which is the central atom: NSF, SNF, and SFN. (a) Write a Lewis diagram for each of these molecules, indicating the formal charge on each atom. (b) Often, the structure with the least separation of formal charge is the most stable. Is this statement consistent with the observed structure for this molecule— namely, NSF, which has a central sulfur atom? (c) Does consideration of the electronegativities of N, S, and F from Figure 3.18 help rationalize this observed structure? Explain. 100. The gasarrow_forwardDraw the shapes of the following molecules and ions in 3-dimension. Show clearly any lone pairs of electrons on the central atom, state the number of bond pairs and lone pairs of electrons on the central atom and name the shape of the molecule or ion. (a) SiCI4, silicon tetrachloride (b) PBr3, phosphorus tribromide (c) CI2O, dichlorine oxide Provide everything stated in the instructions for each compound.arrow_forwardWhich compounds have nonpolar covalent bonds, which have polar covalent bonds, and which have ions? (a) LiF (b) CH3F (c) MgCl2 (d) HClarrow_forwardThe two compounds nitrogen dioxide and dinitrogentetraoxide are introduced in Section 3.13.(a) NO2 is an odd-electron compound. Draw the bestLewis diagrams possible for it, recognizing that oneatom cannot achieve an octet configuration. Use formal charges to decide whether that should be the(central) nitrogen atom or one of the oxygen atoms.(b) Draw resonance forms for N2O4 that obey the octetrule. The two N atoms are bonded in this molecule.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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