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Bond fission, free radicals, carbocations, carbanions and their stability

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Every question from past board papers on Bond fission, free radicals, carbocations, carbanions and their stability, newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

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  1. Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :

    I: benzene with starred ring C-H; II: phenylacetylene with starred terminal alkyne C-H; III: cyclopropane with starred C-H. Options listed below structures

    4 marks · See worked answer →

NEET UG 2024 question paper (official, booklet S6)

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  1. The most stable carbocation among the following is:

    four carbocation structures (options 1-4)

    4 marks · See worked answer →

NEET UG 2018 question paper (official, booklet EE)

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  1. Which of the following carbocations is expected to be most stable ?

    four cyclohexadienyl carbocation structures with NO2, Y, H

    4 marks · See worked answer →