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organic chemistry

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sweetie:
hey,
Q24> da ans is C
but i thought it cud also be A
plz xplain?

Q.27> da ans. is D
but i dont get why??

Thank You!!

ruby92:
In the forward reaction the structure given there has a COOH group as well as OH
the backward reaction cannot be addition since addition only occurs if u have a c=c bond not c=o

ruby92:
in 27 the formula has only one O so it can either be an ester(COO) or alcohol (-OH)
the second info given here tells us that it is unreactive to mild oxidising agents
only tertiary alcohol ie c atoms that have the -OH group are attached to 3 other carbon atoms.
so when u break this bond the place where OH was will be a double bond
this atom must be surrounded by 3 others

make any sense???

sweetie:
okayyyyyyyy!

cud u xplain Q24> in more details

Thank You :D

ruby92:
ok see
the second structure shown the one with the C=O group..u see a double bond anywhere on it??
addition only occurs if the compound has a single or a double C=C not a C=O double bond is there
so u can eliminate that idea out of it.
esters can only be converted back to their original acid alcohol reactants by acid(eg H2SO4) hydrolysis
The first compund has alcohol as well as two acid groups.
these two always react togather to give an aster by esterfication in the presence of conc.H2SO4.

get it??
 

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