ChemistryAdvancedHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Electronic Effects and Reaction IntermediatesNEET
Created by StemPy LabAssertion (A): Both nitrogen-oxygen bonds of nitromethane, , have the same length, which lies between the length of an single bond and that of an 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.
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← A student draws the four structures I to IV in the figure and claims that all of them are resonance structures of propenal, CH₂=CH-CHO. By NCERT's rules, resonance structures keep every nucleus in the same place and differ only in where the electrons are. How many of I to IV are resonance structures of propenal, and which of them contributes most to the resonance hybrid?Read these statements about hyperconjugation. (i) In propene, CH₃CH=CH₂, 3 C-H bonds can take part in hyperconjugation. (ii) In 2-methylpropene, (CH₃)₂C=CH₂, 6 such bonds take part. (iii) In the ethyl cation, CH₃CH₂⁺, the two C-H bonds of the CH₂⁺ carbon overlap with its own empty p orbital. (iv) In 3,3-dimethylbut-1-ene, (CH₃)₃C-CH=CH₂, nine C-H 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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