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Without looking at the structures, give molecular formulas

Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr ISBN: 9780321768414 33

Solution for problem 9P Chapter 3

Organic Chemistry | 8th Edition

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Organic Chemistry | 8th Edition | ISBN: 9780321768414 | Authors: L.G. Wade Jr

Organic Chemistry | 8th Edition

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Problem 9P

Without looking at the structures, give molecular formulas for the compounds in Problem 3-8 (a) and (b). Use the names of the groups to determine the number of carbon atoms, then use the (2n+2) rule.

        

        

Step-by-Step Solution:

Solution 9P :

Step 1:

Here, we are asked to provide molecular formula and determine the number of carbon atoms based on the name of the group :

(a) 4 - (1,1- dimethylethyl)octane :

        The given compound is an alkane and the prefix ‘oct’ in the group name ‘octane’, tells the longest chain in the compound has 8 carbon atoms.

Also, there is  (1,1- dimethylethyl) group on the 4th carbon atom. Ethyl group has 2 carbon atoms and Methyl group has 1 carbon atom and the name ‘diethyl’ indicates there are 2 ethyl groups and hence there are 2 carbon atoms and totally there are 4 carbon atoms in the group.

So, the total number of carbon atoms in the compound which includes the number of carbon atoms in the functional group and the main chain is :

= (8+4) = 12.

Now using the (2n+2) rule, we determine the number of hydrogen atoms in the compound :

        = 2n+2

        = 2(12) +2

        = 26.

Hence, the molecular formula of the above compound is C12H26.

Step 2 of 2

Chapter 3, Problem 9P is Solved
Textbook: Organic Chemistry
Edition: 8
Author: L.G. Wade Jr
ISBN: 9780321768414

The answer to “Without looking at the structures, give molecular formulas for the compounds in 3-8 (a) and (b). Use the names of the groups to determine the number of carbon atoms, then use the (2n+2) rule.” is broken down into a number of easy to follow steps, and 34 words. The full step-by-step solution to problem: 9P from chapter: 3 was answered by , our top Chemistry solution expert on 05/06/17, 06:41PM. Organic Chemistry was written by and is associated to the ISBN: 9780321768414. This full solution covers the following key subjects: use, groups, compounds, determine, formulas. This expansive textbook survival guide covers 25 chapters, and 1336 solutions. Since the solution to 9P from 3 chapter was answered, more than 270 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Organic Chemistry, edition: 8.

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