Answered: Calculating the Number of Degrees of…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Calculating the Number of Degrees of Unsaturation in a Hydrocarbon Calculate the number of degrees of unsaturation in a compound of molecular formula C₄H₆, and propose possible structures.

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Step 1

$D e g r e e o f u n s a t u r a t i o n i s a l s o k n o w n a s D o u b l e b o n d e q u i v a l e n t (D O U) m a k e s i t e a s i e r f o r t h e o n e t o f i g u r e 3 o u t t h e m o l e c u l a r s t r u c t u r e . I t h e l p s t o c h e c k t h e n u m b e r o f π (p i) b o n d a n d t h e c y c l i c r i n g i f p r e s e n t . T h e f o r m u l a i s g i v e a n s f o l o w s D O U (r i n g s + π b o n d s) = C - \frac{H}{2} - \frac{X}{2} + \frac{N}{2} + 1 . . . . . . . . . . . . . . . . . . . . . 1 s t W h e r e, C = n u m b e r o f c a r b o n a t o m s . H = n u m b e r h y d r o g e n a t o m s . X = n u m b e r o f h y l o g e n a t o m s . N = n u m b e r o f n i t r o g e n a t o m s . W e a r e g i v e n a c o m p o u n d w i t h m o l e c u l a r f o r m u l a C_{4} H_{6} . S u b s t i t u t i n g t h e g i v e n v a l u e s i n e q u a t i o n 1 s t D O U (r i n g s + π b o n d s) = 4 - \frac{6}{2} - \frac{0}{2} + \frac{0}{2} + 1 = (4 - 3 + 1) = (1 + 1) = 2 (a n s w e r)$

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