1k...thanx sky di and nishant bhaiya...
i wonder why all my made up questions are way out of JEE syllabus!!! [3]
made up this question...so please dont go into too much chemistry!!
Q. There is an n-membered benzene-like structure. If m no. of methyl groups are attached to the ring, find number of isomers possible.
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21 Answers
9its a garland type problem and nishant sir has already gvn sol
11it is one of the problem hanging around for 8-10 years in my mind lets see if nishant can come up with a ans
33are wo angry wala nahi hai.... angry wala to ye hai.. [16] ya phir x-(
[3]
62(n-1)C(m-1)/2
may seem a very genuine answer..
but i am not fully convinced!
why?
I dontknow :P
62Dont worrysky..
dont waste time now
we willworry about all this after JEE :)
1it looks too much like C++ prog..
but ... i dunno P and C [2] so sorry....
1for n=7, m=2 .... no of iso=p=(7-1)/2 = 3
.....n=7, m=3 ...........p=4 = (3+1)
.....n=7, m=4 (1.e 7-3) .......... p=4
....n=7, m=5 (7-2) .......... p=3
so we can say,
for 2<m<=(n-1)/2 for odd and n/2 for even
p= n-m
for [n-1]/2 < m < n-2 [replace n-1 by n for even]
p=m
and if m=2 or n-2, p=(n-1)/2 for odd and n/2 for even.
62yes sky, It will be very very difficult.
Almost impossible.
I can think of a lot of cases.. but the problem here is that there will be a lotof repetitions which are tough to handle
btw I dont think it is worth thinking at this stage of your IIT JEE preparations
62Think of it like this..
Fix one member
Also think of a garland :)
1thanx!![4]
nishant bahiya, can u plz giv me a hint or sumthing?? thoda aur try kar ke dekhta hoon....
1Ohhh!! P&C wit chem -worst combination shreyan!!...U have to consider all the cases.. but gud Q.. Waiting 4 someone(gud in chem) to answer....:)
