Concept explainers
(a)
Interpretation:Benzene, pyridine and pyrimidine should be represented as hybrids of two contributing structures using curved arrows.
Concept Introduction: The representation of a compound by more than one Lewis structure and the actual structure is said to be the hybrid of all these structures, then the compound is said to possess resonance. The actual structure of the compound is the resonance hybrid.
(b)
Interpretation: Benzene, pyridine and pyrimidine should be shown to has an aromatic sextet.
Concept Introduction: The compounds that contain alternate single and double bonds in the chemical structure and are planar that is all the
(c)
Interpretation:The bond angles and shape of pyridine and pyrimidine should be determined.
Concept Introduction: The compounds that contain alternate single and double bonds in the chemical structure and are planar that is all the
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Introduction to General, Organic and Biochemistry
- Consider the following proposed structures for benzene, each of which is consistent with the molecular formula C6H6. (iv) CH3CCCCCH3 (v) CH2=CHCCH=CH2 When benzene reacts with chlorine to give C6H5Cl, only one isomer of that compound forms. Which of the five proposed structures for benzene are consistent with this observation? When C6H5Cl reacts further with chlorine to give C6H4Cl2, exactly three isomers of the latter compound form. Which of the five proposed structures for benzene are consistent with this observation?arrow_forwardArrange the following compounds in increasing order of their property as indicated :(i) CH3COCH3, C6H5COCH3, CH3CHO(reactivity towards nucleophilic addition reaction)(ii) Cl—CH2—COOH, F—CH2—COOH, CH3—COOH (acidic character)arrow_forward5) Which of the following compounds is aromatic? B C H Darrow_forward
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- An organic compound S reacted with ozone to give compounds Q and R. Both Q and R react with NaOH/I2 to produce a yellow precipitate with antiseptic smell. Q reacts with HCN to produce the compound CH3C(CH3)OHCN while R gives a silver mirror with Tollens reagent. I) write the structural formulae and names of Q,R,S and the Yellow Precipitate. II) write equations to show the reactions Q with NaOH/I2 and R with H^+/Cr2O7^2-arrow_forwardWhich of the following compounds is (are) aromatic? 'N' O. H II IV Varrow_forwardBenzopyrene, naphthalene and pyrene are members of these group of aromaticcompounds: *Non-benzenoid aromatic compoundsHeterocyclic aromatic compoundsBenzenoid aromatic compoundsHeteronuclear compoundsWhat type of aromatic compound is pyridine? *Benzenoid aromatic compoundNon-benzenoid aromatic compoundHomonuclear cyclic compoundHeterocyclic aromatic compoundWhat property of aromatic rings prevent the involvement of the conjugated structure toaddition reactions? *Radical stabilizationResonance stabilityInductive effectAromatic effectarrow_forward
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