1.

Write the names of the following: (i) CH_(3)CH_(2) - C -= CH (ii) CH_(3) CH_(2) OH (iii) CH_(3)COCH_(3).

Answer»

`igt iii gt ii`
`igt ii gtiii`
`ii gt igt iii`
`iii gt igt ii`

Solution :In active methylene compound (ii), methylene `(-CH_(2))` group exists in between two strong EWGs i.e. `(CH_(3)CO-)`,
which increases the ACIDITY. Esters (iii) are LESS ACIDIC than ketones (i) because the enolate ion produced from an ester is less stable than that produced from a ketone.
Hence,
`CH_(3)-overset(O)overset("||")C-underset("(ii)")(CH_(2))-overset(O)overset("||")C-CH_(3) gt CH_(3)-overset(O)overset("||")C-underset("(i)")(CH_(2))-overset(O)overset("||")C-OC_(2)H_(5)gtC_(2)H_(5)O-overset(O)overset("||")C-underset("(iii)")(CH_(2))-overset(O)overset("||")C-O-C_(2)H_(5)`


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