Messages posted by Debotosh Chatterjee

cross aldol condensation, in acidic medium i.e. by formation of enol !

collections from previous goiit articles :

1)Area of the triangle made by the line ax+by+c=0 and the co ordinate axes is c²/(2ab)

2)Area of the rhombus formed by ax(+or-)by(+or-)c=0 is 2c²/ab

3)If ABCD is parallelogram

then D=A-B+C

Eg:If (1,6),(2,5),(5,1) are three vertices of a parallelogram

then fourth vertex is (1-2+5,6-5+1) ie(4,2)

4)The foot of the perpendicular (h,k) from (x₁,y₁) to the line ax+by+c=0 is given by

(h-x₁)/a=(k-y₁)/b= -(ax₁+by₁+c)/(a²+b²)

5)The image or reflection of the point (x₁,y₁) in the line ax+by+c=0 is (h,k) where

(h-x₁)/a=(k-y₁)/b= -2(ax₁+by₁+c)/(a²+b²)

(4) and 5) can be applied to 3-D geometry too!)

6)The area bounded by y²=4ax andx²=4by is given by (4a)(4b)/3

7)The area bounded by y²=4ax and the line y=mx is 8a²/(3m³)

8)The area bounded by y²=4ax and its latus rectum x=a is 8a²/3

excellent copy !!!!

best of luck !!! go ahead !!!

hoping to get the best of response from everybody over here !!!

hi...please join my forum ...http://organic-masters-shell.lefora.com/...for active discussions in all topics for JEE ...with special focus on organic chemistry !!! it is soon going to be transformed into a vibrant stage for IITJEE !! all the best...hope you take advantage of the notes and analysis put up there in"admin's corner"

bogus and very common old advice....need to have something new!!!!

stupidity at its best !!!

common sense !!!!

CH3Cl > CH2Cl2 > CHCl3 >CCL4

good!!!

funny and tricky!!!!!!!!!!

stupid question.......-CHO - group at 1,6 positions of normal hexane chain!!!!!!

well i think i had something vague in mind last time......etard's reaction is actually meant for "an aromatic or heterocyclic bound methyl group "

more rates and comments!!!!!

Time for some female bashing. Q: What is the difference between women and puppies? A: Puppies grow up. Q: Why do women always have a stupid look on their faces? A: Because they are... Q: What do women have in common with ceramic tiles? A: Fix them properly once and you can walk all over them forever. Q: If you drop a women and a brick out of a plane, which one would hit the ground first? A: Who cares?????..... Q: What did God say after he created women? A: I can do better than this! And then he created woman!!!. Q: What's the difference between an intelligent women & a UFO ? A: I don't know, I've never seen either. Q: What are two reasons why women don't mind their own business? A: i) no mind ii) no business Q: What is the common thing between women and pigs? A: every thing!! Q: What makes women chase men they have no intention of marrying? A: The same urge that makes dogs chase vehicles they have no intention of driving. Q: What do you do with a women who thinks he's God's gift? A: Exchange him!! Q: Why do women like talented men? A: Opposites attract.

donot post such stupid questions.....this is simple calculation....for mcq purpose use hit and trial!!!

so stupid.......remember this is an educational site(ofcourse,,it no longer is)....and these kinds of articles only kid away with the seriousness of any such site!!!

Preparing for JEE?

Kickstart your preparation with new improved study material - Books & Online Test Series for JEE 2014/ 2015

@ INR 4,950/-

For Quick Info