44) A
5) A
1- Suggest a Chemical Test to distinguish b/w -
2- Chloro Benzene is subjected to the following-
i)Nitration mixture
ii) Cl2/FeCl3
iii) NH2-NH2
The Final Product is ?
3)
A: Only method of preparing F2 is electrolytic oxidation of F- ion.
R: F2 has highest oxidaton potential value as compared to any other substance.
4)
A: (Me)3-C(=O)-OH + MeOH --(conc. H2SO4)--> Me3C-(C=O)-OMe
R: In esterification, removed water molecule has H of alcohol & OH of acid.
5) Which one is used to increase hardness of a silicone polymer-?
a)R2-SiCl2
b)R-SiCl3
c)R3-SiCl
d)N.O.A
-
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8 Answers
43) I think ans is D
In 1986, when preparing for a conference to celebrate the 100th anniversary of the discovery of fluorine, Karl Christe discovered a purely chemical preparation involving the reaction of solutions in anhydrous HF, K2MnF6, and SbF5 at 150 °C
2 K2MnF6 + 4 SbF5 → 4 KSbF6 + 2 MnF3 + F2
Though not a practical synthesis on the large scale, this report demonstrates that electrolysis is not the sole route to the element.
SOURCE : WIKI
13Okay, so the answers are--
1) Iodoform (Done)
2) Done, no problem.
3) A (How?,,, I thot Fluorine had the least oxidation potential value i.e. most -ve.)
4) D (Strange..!!)
5) B (I think it has got smthing to do with 3-sided cleavage prop. of R-SiCl3, But what is the exact mech. behind hardening ?)
131)- IodoForm correct.
@Pritish, U urself gave it as a wierd exception here-
http://targetiit.com/iit-jee-forum/posts/exceptions-in-organic-chemistry-15386.html
Also, All the answers given are liable to be correct. :P
1oops for 5) it is b
u see as the compound can form 3 bonds...it will get attached to the chain wit and form crosslinks with its third one