[urvashi314]

i had this ques.
is B.P of p-hydroxybenzoic acid more thn o-hydroxybenzoic acid because of intramolecular hydrogen bonding in the latter

and do u know what does H-bonding effect B.P or M.P

[nj_bartel]

I don't really understand your first question.  Typing it out without all the typos would probably help.

As far as hydrogen bonding, it typically increases mp/bp because it's a strong intermolecular force that holds molecules together.

[urvashi314]

my question meant that is it only melting point (M.P) which is effected by hydrogen bonding or does it effect boiling point (B.P) also.1

2. i wanted to know the B.P and M.P of para-hydroxybenzoic acid and ortho hydroxybenzoic acid

[Astrokel]

hi,

intermolecular affects both boiling and melting point, as for the B.p and M.p of the two compounds, you can try google, no?

[nj_bartel]

p- has a very high melting point.  If you really need it as a gas, I'd say the best route to shoot for is heating under vacuum. (mp available on wiki)

o- has a moderately high mp, but not too awfully high of a bp.  (Both are available on wiki.)

[urvashi314]

thnx but i guess my question deals with some more complex concepts related to symmetry of crystalline structure which will take yonks to explain on net!