ChemistryHardHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Electronic Effects and Reaction IntermediatesNEETJEE Main
Created by StemPy LabRead these statements about hyperconjugation. (i) In propene, , bonds can take part in hyperconjugation. (ii) In 2-methylpropene, , such bonds take part. (iii) In the ethyl cation, , the two bonds of the carbon overlap with its own empty p orbital. (iv) In 3,3-dimethylbut-1-ene, , nine bonds take part. (v) Hyperconjugation delocalises the σ electrons of a C-H bond on a carbon next to a π bond or to a vacant p orbital. How many of the statements above are correct?
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← Assertion (A): Both nitrogen-oxygen bonds of nitromethane, CH₃NO₂, have the same length, which lies between the length of an N-O single bond and that of an N=O double bond. Reason (R): Nitromethane is a mixture of two forms, I and II, which turn into each other so fast that the two bonds look equal on average.The figure shows two laboratory set-ups, X and Y, used to purify organic liquids. Two statements about them are given below.
Statement I: Set-up X is used when the liquids of a mixture boil at close temperatures, as for the fractions of crude oil; the higher boiling part condenses in the column and runs back.
Statement II: In set-up Y, the organic liquid distils over only when the flask reaches the boiling point of that liquid, because the steam only brings heat into the flask. →
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