Glucosamine (R = H), a naturally occurring substance found in the ...

[jon_i]

Glucosamine (R = H), a naturally occurring substance found in the exoskeleta of marine invertebrates, is believed by some to be helpful in relieving arthritic symptoms in humans. What are, respectively, the relative positions of the amino group to the CH2OH substituent and OR group?
 
  1.cis, cis
  2.trans, trans
  3.cis, trans
  4.trans, cis
  5.cannot be determined from this kind of perspective drawing

Question 2

How many secondary hydrogens are there in the cycloalkane shown below?
 
  1.2
  2.3
  3.4
  4.5
  5.6

Question 3

What is the IUPAC name for the following molecule?
 
  1.1-(2-methylbutyl)-cyclopentane
  2.2-(3-methylbutyl)-cyclopentane
  3.2-(2-methylbutyl)-cyclopentane
  4.(1,2-dimethylpropyl)-cyclopentane
  5.(2,2-dimethylpropyl)-cyclopentane

Question 4

The highest energy conformation of ethane has 12 kJ/mol of strain. The two highest conformations of butane have 16 and 19 kJ/mol of strain, respectively. How much strain does the highest energy conformation of 2,3-dimethylbutane have?
  1.16 kJ/mol
  2.20 kJ/mol
  3.26 kJ/mol
  4.31 kJ/mol
  5.37 kJ/mol

[IAPPLET]

Answer to Question 1

2

Answer to Question 2

3

Answer to Question 3

4

Answer to Question 4

3

[jon_i]

Thanks for the timely response, appreciate it

Gracias!