The increasing order of basicity for the following intermediates is (from weak to strong)
v < iii < ii < iv < i
iii < i < ii < iv < v
v < i < iv < ii < iii
iii < iv < ii < i < iv
1. Basicity is inversely proportional to electronegativity.
2. Basicity is inversely proportional to the stability of the negative charge.
i) is most unstable due to the three +I effects which will destabilise the negative charge, So it will be most basic in nature.
iv) will be second-most unstable, it will be second most basic among these.
the order which matches is: 1) v < iii < ii < iv < i
We do not compare ii, iii and v without checking the data of pka value.
Hence, option number (1) is correct.
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