Chemistry MCQ...CHIRAL CENTRE ??

[kanz123]

http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf

QUESTION N0. 19 ???


http://www.xtremepapers.me/CIE/Internat ... 6_qp_1.pdf

QUESTION N0. 21 ???

h0w to find a chiral centre :S??? i cnt do dat
n can sum1 plz temme h0w to post the question itself ?..

 

[workinghard]

i ll gv it a look .. kindly wait!

 

[workinghard]

chiral centres are da onex 2 which 4 diff groups r attached
1st condition is single bonds on all 4 sides
2nd is da presence of 4 diff groups
sometimes in benxene ring dere's a confusion since no hydrogen atom is shown while dere r present..
but i ve atached da solution 4gt 2 mark da ans ... dey r B rite?!

 

[sheikfathiu]

chiral centre is a carbon atom with 4 different atoms attached to it.
any carbon with double bond cannot be a chiral centre.
so look at the que very well and count the no of C with 4 different things attached to it.

 

[kanz123]

ok for the 19th question 1 chirall centre is with a H group,oh group,ch group and a CH2 group

wt abt the 2nd chiral carbon atom ? :s

 

[workinghard]

1 C is attached 2 OH CH2OH H n da whole benzene thing
2 C is attached 2 h, CH OH CH2OH n consder a break at benxene ring at any point into 2 chains n dey ll b ur 2 diff groups u get wat i am saying?

 

[lychee26]

im also having problems. i didn't get it.... could you please explain it again?

 

[kanz123]

hey i d0nt get this..plz cud u tell it with the question no. ?..wich question r u twking abt the 19th or 21st??

 

[workinghard]

hope this helpx

 

[kanz123]

ohh gr8...i g0t ittttt ! =D =D ..thnkxxx