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Share/Save/Bookmark Login/ Register to Bookmark Topic : "Optical activity" Started by Asish

Asish

#1 Posted 3:15pm 09-02-10  

Optical activity

Q1. Which of the following isomers of dichlorocyclohexane are optically active?
(a) 1,1 dichloro    
(b) 1,2 (cis) dichloro
(c) 1,2 (trans) dichloro
(d)  1,3 (cis) dichloro
(e) 1,3 (trans) dichloro
(f) 1,4 (cis) dichloro
(g) 1,4 (trans) dichloro
You dont walk to IIT, IIT walks 2 u!!  Edited on 3:25pm 09-02-10    

Asish

#2 Posted 3:29pm 09-02-10  

Re: Optical activity

Q2. [image]41209401.jpg[/image]
Comment on the optical activity/inactivity of the following compound
You dont walk to IIT, IIT walks 2 u!!    

Anirudh

#3 Posted 6:13pm 09-02-10  

Re: Optical activity

2)

isn't above compound a meso compound it has a plane of symmetry.
optically inactive
   

Asish

#4 Posted 10:36am 10-02-10  

Re: Optical activity

Yeah it should be a meso compound but what if you reflect the compound about its bottom portion. then you cant superimpose the mirror image on the original compound. So it should be optically active.

You dont walk to IIT, IIT walks 2 u!!    

Anirudh

#5 Posted 3:36pm 10-02-10  

Re: Optical activity

yes. bhaiya if we reflect it about the plane of the carbon cycle.
   

govind

#6 Posted 4:49pm 10-02-10  

Re: Optical activity

(a) 1,1 dichloro                            inactive(since different grps shud be attached to carbon for it to be chiral)
(b) 1,2 (cis) dichloro                         inactive(symmetry)
(c) 1,2 (trans) dichloro                     active
(d)  1,3 (cis) dichloro                        inactive(symmetry)
(e) 1,3 (trans) dichloro                     active
(f) 1,4 (cis) dichloro                          inactive(symmetry)
(g) 1,4 (trans) dichloro                     inactive(point of symmetry)
   

Asish

#7 Posted 11:03pm 10-02-10  

Re: Optical activity

(b) 1,2 (cis) is chiral but inactive
the compound has NO symmetry yet it is inactive.
You dont walk to IIT, IIT walks 2 u!!    
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