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Chemistry ppr 1 doubts

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moon:
can somebody help me in solving ppr1 June. 07 Q16,18,34,39 appreciate ur help.

nid404:

--- Quote from: moon on June 02, 2010, 11:01:54 pm ---can somebody help me in solving ppr1 June. 07 Q16,18,34,39 appreciate ur help.

--- End quote ---

16) As the size of the atom increases down group 7, the electronegativity decreases and the bonds are held less stongly. Bond enthalpy decreases. Hence C

18) The gas given off will be ammonia. The only compound that can give off  ammonia is D(check the fornula)

34) Rise in temp, increases the rate of forward reaction...implies delta h is positive. Hence only 1

39) There are 3 chiral carbons. 1 is wrong.  2 is right because the alkene could form between any of the  Carbon atom...either the one to the right of OH or to the left. 3 is right cause it's a secondary alcohol and will be oxidised to ketone on reacting with Cr2O7...Cr changes color from orange Cr+6 to green Cr+3

moon:
Thanks a lot nid. i really appreciate your great help.Thanks once again :)

nid404:
Anytime  :)

sweetie:
need help in Q 10,23,39 of nov04

thanx 4 any help!

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