Hi Ultima , may i ask you,
Markovnikoff's rule states that in the addition of H-X or H-OH
to a C=C bond in an asymmetrical alkene, the H atom attaches itself
to a C atom that already holds the greater amount of Hydrogen
atoms.
May i ask this :
https://www.dropbox.com/s/9bahzdn6n96o91s/20160324_223727.jpg?dl=0
How to know Br and OH attach where??
For electrophilic addition of X2 (aq) to (asymmetrical) alkene
to form halohydrin , how to determine X and OH form
where?
Cambridge will *not* accept Markovnikov's rule (or Zaitsev's rule,
for that matter) as a reason, if Cambridge asks why a particular
product is the major product (eg. "Draw the major product, and
explain why it is the major product."). To get full marks, you
need to draw both mechanisms (or at the very least, both the
carbocation intermediates) for both products, then specify which
carbocation is the more stable carbocation (ie. benzylic
carbocation > allylic carbocation > tertiary carbocation >
secondary carbocation > primary carbocation), then explain "The
more stable the intermediate, the lower the Ea required, hence the
faster the rate of reaction, hence we get more of the product,
which we label as the major product."
If you still can't figure it out, ask during tuition (after you
join).
