Question

4. Which reaction sequence would be expected tion sequence would be expected to produce an aldehyde as a product? A. Benzyl alcohol + Na2Cr207 + H2SO4 B. 1-butyne + (Sia) BH; then H2O2, KOH, HOH C. 1-methylcyclohexene + ozone; then CH3SCH3 D. 1-pentyne + HOH + HgSO4 + H2SO4 E. None of these reactions would produce an aldehyde. F. More than one of these would produce an aldehyde. 5. Arrange these substances in order of INCREASING reactivity toward nucleophilic substitution (i.e. least reactive < ... <most reactive). Oso el olo olt HN A. I< I< || < 11 B. IV < ll < III <1 C. I< || < III < IV D. IV < III < |<! E. None of these orders is correct

Please explain your answer, thanks!

Answer 1

4. (F) More than one of these would produce aldehyde.

Here are two reaction which can produce aldehegde. as a product. These reactions are - butjene & (sia), BiH i then Hallz, ROH, Holt ( their H2 - CH₂ CH₂ + H B l sia) - си, со (sia) Bo? Hz 2 | KOH/H20 lt er CH₂ CH₂CH3 . . '' 1-methyl cyclohexene to zone; thein (th-setta ... % = Qз CHOH CHz feltz.. B Y Ulta .

5. (D) None of these orders are correct.

5. The correct order of increasing reactivity is acid chlorid (1), acid anhydriediyyester (11) amide (1) jie (0) CIV) > CWD >(I). Reason: Electronegative element attached to (628) carbonyl group will increases the reactivity of the compound. . Eelectron attraction ability of these group are cu Celectronegative element)> or (-5, e Heer d-R. esteer) > 0 [more electronegative but has & R effect") > .NHL (+ R effect to high dee to .. lower electronegativity of N-atom).