. Which isomer
will react faster with HCN and why ? Explain the mechanism of the reaction
also. Will the reaction lead to the completion with the conversion of whole
reactant into product at reaction conditions ? If a strong acid is added to the
reaction mixture what will be the effect on concentration of the product and
why ?
Answer:
The
functional isomers of the carbonyl compound with 
are :
Due to less +I-effect of one 
group as compared to two
groups in 
and less steric hindrance,
compound I,
will react faster with
HCN than compound n 
. For
mechanism, refer to sec. 12.6.1.3 pages 12/24-12/25.
The reaction will not proceed to completion since it is a
reversible reaction. Addition of strong acid inhibits the reaction because the
formation of 
from HCN is prevented.
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