Concept explainers
Interpretation:
The resonance structures for each of the given compounds are to be written.
Concept introduction:
In the conjugated systems, conjugation is the interaction of p-orbitals with one another across an intervening sigma bond.
A conjugated system, in simple words, can be represented as a system in which compounds have alternate double bonds and single bonds.
The delocalization of unpaired electrons results in the increase of stability of the primary, secondary, and tertiary carbocations.
Resonance is defined as the movement of pi-electrons from one carbon to another in order to stabilize the charged intermediates.
Having a higher resonance or more resonant structures means more stability.
Resonant structures do not actually exist on their own. It is a study of the mechanism for the formation of an organic compounds.
Only electrons can be moved while writing resonance structures.
All structures should be in proper Lewis structures.
All resonance structures should have the same number of unpaired electrons.
All atoms that contribute in the delocalized
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EBK ORGANIC CHEMISTRY
- Describe briefly with either UV-Vis or IR spectroscopic method that could be employed to distinguish one compound from the other for the following pairs: (1) H,C=CHCH=CH, and HC=CCH,CH, (2) CH,CH,CH,CH, and CH,-CHCH,CH,Oнarrow_forward2A(1) Which of the following compounds (I-III) are aromatic, antiaromatic or neither from both. Please explain briefly in each case H H I H =arrow_forwardThere are several isomeric alkanes of molecular formula C6H14.Two of these exhibit the following 1H-NMR spectra. Propose a structure for each of the isomers. Isomer A: δ = 0.84 (d, 12 H), 1.39 (septet, 2H) ppm Isomer B: δ = 0.84 (t, 3 H), 0.86 (s, 9H), 1.22 (q, 2H) ppmarrow_forward
- 2A(2) Which of the following compounds (IV-V) are aromatic, antiaromatic or neither from both. Please explain briefly in each case NO₂ N N IV -N H₂C Varrow_forwardThere are several isomeric alkanes of molecular formula C6H14. Two of these exhibit the following 1H-NMR spectra. Propose a structure for each of the isomers. Isomer A: δ = 0.84 (d, 12 H), 1.39 (septet, 2H) ppm Isomer B: δ = 0.84 (t, 3 H), 0.86 (t, 9H), 1.22 (q, 2H) ppmarrow_forward(a) Structure A shown below is a badly drawn organic molecule HO- CH3 COOH H A Explain, with reference to orbital hybridisation, why structure A is incorrect. Draw a correct representation of the structure. (i) (ii) Give the IUPAC name for structure A and show how you determined it.arrow_forward
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- For each of the following structures, would you predict these molecules to possess aromaticity? Why or why not? (a) B1 (c) (d) (a) 4 iπ electrons, antiaromatic 10 iT electrons in each ring, aromatic (b) (c) π electrons, aromatic 8 TT electrons, antiaromatic 6 (d) 00arrow_forwardIn Section 15.5c, we learned that the frequency of a C=0 stretch decreases when the c=0 bond is conjugated to a C=C bond. Draw the pertinent resonance contributor of a conjugated carbonyl (C=C-c=0) and, based on the resulting resonance hybrid, explain why the frequency decreases.arrow_forwardDraw an isomer of C4H9Cl that would be expected to have four resonances in its 13C NMR spectra.arrow_forward