How will you convert ethnal into the following compounds ?
i. Butane-1,3-idol , ii. But-2-enal
iii. But-2-enoic acid

Explanation

(i) `underset("Ethanal")(2CH_(3)CHO) underset(("Aldol condensation")) overset("Dil. NaOH")to underset("3-Hydroxybutanal")(overset(4)(C)H_(3)-overset(3)(C)HOH-overset(2)(C)H_(2)-overset(1)(C)HO underset(("Reduction")) overset(NaBH_(4))to underset("Butane-1,3-diol")(overset(4)(C)H_(3)-overset(3)(C)HOH-overset(2)(C)H_(2)overset(1)(C)H_(2)OH`
(ii) `underset("Ethanal")(2CH_(3)CHO) underset(("Aldol condensation")) overset("Dil. NaOH")to underset("3-Hydroxybutanal")(overset(4)(C)H_(3)- overset(3)(C)HOH-overset(2)(C)H_(2)-overset(1)(C)HO underset(-H_(2)O)overset(H_(3)O^(+)//Delta)to underset("But-2-enal")(CH_(3)-CH=CH-CHO)`
(iii). `underset("Ethanal")(CH_(3)CHO) underset("Above") overset("As in (ii)")to underset("But-2-enal")(CH_(3)CH=CHCHO) underset("Tollens' reagent")overset([Ag(NH_(3))_(2)]^(+)OH^(-))to underset("But-2-enoic acid")(CH_(3)CH=CHCO_(2)H)`