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The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, due to 

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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JEE Advanced
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Consider the following four compounds I, II, III, and IV.

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Choose the correct statement(s).

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Total number of isomers, considering both structural and stereoisomers, of cyclic ethers with the molecular formula C4H8O is ________
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For the given compound X, the total number of optically active stereoisomers is ____.

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Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is
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Newman projections P,Q,R and S are shown below:

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  Which one of the following options represent identical molecules?

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Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?