iTeachChem
A Study Community for Everyone and Everything. We have weekly sessions on Spirituality, Math and Science! JEE, NEET prep? All doubts are crowdsourced. Hare Krishna!
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iTeachChem
A Study Community for Everyone and Everything. We have weekly sessions on Spirituality, Math and Science! JEE, NEET prep? All doubts are crowdsourced. Hare Krishna!
Join
Haloalkanes
for (c) I am getting the answer as R = 2 (ans is given as R=0)
Why can't SN2 reaction occur at the circled positions (in 2nd image)...
Isoelectronic
for this question i added all the atomic no of the elements and then if it is -ve i added the charge , but the solution used EAN why?
Kinematics
if we take the horizontal velocity as the same as the initial velocity in the vertical motion, who is stopping the horizontal motion, so infinte ni hona chahiye?
Solutions
how is it B??
if the solution volume would increase the pressure of solution would decrease even more and pressure of solvent would increase
D makes more sense to me since Solution Vaporises more and its VP increases and Solvent Condeses and VP dcreases and eventually equilibriates...
PCR
In PCR, the temperatures are 90-95°C for denaturation, 42-55°C for annealing, and 70-75°C for extension right? So answer is supposed to be A? Why is it given to be B?
solutions
in this que i used the method of if it was with OH and Cl respectively what i would get but the ans is 1:1 and what i am getting is 2:1 so why isn't my method giving right answer?
SHM on a rotating disc
This is most likely not relevant for jee (as told by our teacher), but how would one begin to approach this?
[*One image didn't get attached so its posted below]...
Rotational
he said condition for N <= 0 is that cos theta >= root 2/3
so shouldnt 3rd be the correct option , contact force btw them should be 0 since normal is 0...
Time and Work (Math)
previous year question from ISI entrance exam 2018
need solution to question 26, answer given is (C) 45...
Biomolecules
he said at PH 7 it will exist as zwitter ion and for +ve charge there should be NH2 in group , and not CONH2 he did not give reason , why wont CONH2 work?
