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Why allylic and benzylic carbocation are more stable than tertiary carbocation?

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Increasing order of stability of the resonance structure is:

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Which one among the following resonating structures is not correct?
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Draw the resonating structures of Aniline.
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Arrange the following compounds in order of decreasing acidity :
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Resonance effect is not observed in
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The order of stability of the following carbocations:
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Draw the resonating structures of Urea.
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In pyrrole, the electron density is maximum on

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The most acidic proton and the strongest nucleophilic nitrogen in the following compound

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respectively, are

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The chlorine atom of the following compound

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that reacts most readily with AgNO3 to give a precipitate is

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A solution of (-)1-chloro-1-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :
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Which of the following molecules is least resonance stabilized?
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Consider the following compounds

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Hyperconjugation occurs in:
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Which of the following statements is not correct for a nucleophile?

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In which of the following compounds, the C-Cl bond ionization shall give most stable carbonium ion?
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The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, due to 
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The correct sequence of reagents for the following conversion will be

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Among the given species the Resonance stabilised carbocations are:

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The correct order of stability for the following alkoxides is:

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In which of the following molecules, all atoms are coplanar?