1.

An organic compound 'X' having molecular formula C_(5)H_(10)O yields phenylhydrazone and gives negative response to the iodoform test and tollens' test. It produces n-pentane on reduction. 'X' would be

Answer»

3-pentanone
n-amyl alcohol
pentanal
2-pentanone

Solution :SINCE X `(C_(5)H_(10)O)` forms a phenylhydrazone but does not give TOLLENS' test, it cannot be an aldehyde but must be a ketone. Since (X) on reduction GIVES n-pentane, therefore, it must be a straight chain ketone. Since (X) does not give, iodoform test, it cannot be a methyl ketone.. therefore, it must be 3-pentanone.
`underset("3-Pentanone")(CH_(3)CH_(2)-overset(O)overset(||)(C)-CH_(2)CH_(3)) overset("Reduction")to underset("n-Pentanone")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(3))`


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