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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
sadly life is not masti in IITK with MTH 101 making first yr hell fr all freshers (no exception)... even got seniors repeating the course  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
sadly life is not masti in IITK with MTH 101 making first yr hell fr all freshers (no exception)... even got seniors repeating the course    

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
God made the laws only nearly symmetrical so that we should not be jealous of His perfection!- Feynman    

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.

sadly life is not masti in IITK with MTH 101 making first yr hell fr all freshers (no exception)... even got seniors repeating the course    

Anirudh

#5 Posted 3:36pm 10-02-10  

Re: Optical activity

yes. bhaiya if we reflect it about the plane of the carbon cycle.
God made the laws only nearly symmetrical so that we should not be jealous of His perfection!- Feynman    

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.
sadly life is not masti in IITK with MTH 101 making first yr hell fr all freshers (no exception)... even got seniors repeating the course    
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