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This cycloaddition reaction involves sixteen electrons; hence, it must be suprafacial on one component and antarafacial on the other. Thus, it must be a [14s + 2a] or a [14a + 2s] cycloaddition. The heptafulvene molecule is large enough that its p-electron system can twist without introducing too much strain or without losing too much p-electron overlap; hence, the cycloaddition is a [14a + 2s] process. In either case, the product has the following stereochemistry:
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Q. Objectives of transition elements of the f-block? After studying this unit you should be able to: distinguish between transition and inner-transition elements, d
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Number of electrons in -CONH 2 is: (1) 22 (2) 24 (3) 20 (4)28 Ans:24
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The maximum number of electrons that can be accommodated in f sub shell is : (1) 2 (2) 8 (3) 32 (4) 14 Ans: 14
Classification of Carboxylic acids (a) Carboxylic acids are categorized as dicarboxylic acids, tricarboxylic acids and monocarboxylic acids etc. depending upon the number of -
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