1 Give the mechanism for the synthesis of tyrbostin from benzaldehyde. Show how the carbanion is generated from malononitrile (NCCH2CN) and stabilised (5 marks).

Show the reaction of the carbanion with the benzaldehyde (5 marks). Show how the

resulting alkoxide (O-) is protonated (5 marks). Show how the alkene bond is formed

(5 marks)

CN

ON

&

NCCH2CN

Piperidine

Aldehyde

Tyrphostin

ted Kingdom)

Focus

since electrons are negative the answer is neagtaive

nuhygjhuhuouh9oygyuhuh8h9guig97uogh8uog978o0rfyhkmkv h

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.