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(a) Write the structures of the main products where ethanal ( CH_(3) - CHO )reacts with the following reagents. (i) HCN (ii) H_(2) N - NH_(2) //H^(+)(iii) LiAlH_(4) (b) Arrange the following in increasing order of their reactivity towards nucleophilic additon reactions : C_(6) H_(5) COCH_(3), CH_(3) - CHO, CH_(3) - CO - CH_(3) (c ) Give a simple chemical test to distinguish between the following pair of compounds : CH_(3) CH_(2) CHOand CH_(3) CHO |
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Answer» Solution :(a) (i) `CH_(3) - overset( O)overset( ||)(C ) - H rarr underset("Cyanohydrin")(CH_(3)-overset( OH)overset( |)(C ) - CN)` (ii) `CH_(3) -overset( O)overset( ||)(C ) - H + H_(2) N- NH_(2) rarr `  (iii) `CH_(3) -overset( O) overset( ||)(C ) - H + 2[H] overset( LiAlH_(4))(rarr) CH_(3) CH_(2) OH` (b) INCREASING order of reactivity towards NUCLEOPHILIC addition reaction is `C_(6) H_(5) COCH_(3) lt CH_(3) COCH_(3) lt CH_(3) CH_(2) OH` (c ) `CH_(3) CHO` gives a YELLOW precipitate of `CHI_(3)` with NaI `( NaOH//I_(2))` while `CH_(3) CH_(2) CHO` does not `CH_(3) CHO + 3NaOI rarr underset ( "Iodoform")(CHI_(3)) + HCOONA + 2NaOH` |
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