Which of the following compounds cannot react as a diene in a Diels - Alder reac

Question

Which of the following compounds cannot react as a diene in a Diels - Alder reaction? A) B) C) D) Which one of the following is not readily oxidized by K_2 Cr_2 O? in H_2 SO_6/H_2 O? A n - butyl alcohol B. isobutyl alcohol C. sec - butyl alcohol D tert - butyl alcohol What is the product of the following reaction? A. CH_3 CH = O B. meso - 2, 3 - butanediol C racemic (2R, 3R) and (2S, 3S) - 2, 3 - butanediol D, cis 2, 3 - epoxy butane Identify the reagent needed to carry out the following conversion. A. K_2 Cr_2 O_7, H_2 SO_4 H_2 O B. PCC/CH_2 Cl_2 C. HlO_4 D. OsO_4, (CH_3)_3 COOH, (CH_3)_3 COH, OH^-

Explanation / Answer

5. (c) Becuase the conjugated double bonds are in trans position.

(6) (d) Tertiary alcohols are not ready to get oxidised.

(7) (B) Meso

OsO4 gives meso diol with cis alkenes and racemic mixture with trans alkenes.

(8) (B) PCC/CH2Cl2

Oxidation of primary alcohols can be stopped after the formation of aldehyde by using PCC/CH2Cl2

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