Physics, Chemistry, Mathematics Forums

write the structures of the expected products of Aldol condensation:

a)2-methtylpentanal  b)cyclohexanone  c)1-phenylacetaldehyde  d)phenylpropanone

Pls reply at the earliest....

hi friends,

i have a simple question.

Does para-benzo-quinone show tautomerism?

b.p of ketones is due to:

a) H-bonding          b) Van der waal forces         C) dipole-dipole interactions          d) any other

According to me two possibilities are there.b) option is present in all molecules and C) is on addition to it for some molecules and is not an alternative to it. But Answer given in O.P.Agrawal is C)

Please help me by giving your suggestions on this.

In a regular hexagon ABCDEF, triangles ACe and BDF are drawn producing another regular hexagon. Find the ratio of the area of ABCDEF to the area of the new regular hexagon.

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can anyone help me how to solve problems like compound (A when treated with X forms comp B) etc

Can anyone try to give a proof for the formula of finding centre of mass which is given mostly in any book as a standard formala as

                                             

Try it. If you fail, contact me.I have done it.

Can anybody plz solve this prob. on limits. Also, if u use L'Hospital's Rule, then plz explain me that also.

lim (e^x - x)
---------
1 - cosx
x-->0

(Edited by INDIANET @IIT-JEE - Thursday, 13 April 2006, 10:21 AM)

Hello friends,

The bond angle of hydrides of 5th group decreses as:

NH3===107 deg.

it is sp3 hybridised and the presence of a lone pair reduces bond angle by roughly 2 deg.

bond angle of PH3 is===93 deg.

what is the reason of the decrease of the bond angle by such a value despite the fact that PH3 is also sp3 hybridised,

does higher elecronegativity of nitrogen account for this fact??

pls answer my query.

HELLO FRIENDS,
CAN ANYONE PLEASE TELL ME WHAT IS THE CRITERIA TO DECIDE WHETHER AN ION IS COLOURED OR NOT.HENCE PLEASE TELL ME WILL THE ION

(CrO4)^(-2) HAVE COLOUR OR NOT

d/dx x² is clearly 2x

but x² can be written as x+x+x+x+x+....(x times)

now if u differenciate this u will get 1+1+1+1+1+1+...(x times)

which is x

therefore d/dx x² is x