Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry

In the following reaction,
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the absolute configurations of the chiral centres in X and Y are

A) 2S, 3R and 2R, 3R B) 2R, 3R and 2R, 3S C) 2S, 3S and 2R, 3R D) 2S, 3R and 2S, 3R

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Answer & Solution

Answer: Option A

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The reaction between X and Y to give Z proceeds via
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A) 4π-conrotatory opening of X followed by endo Diels-Alder cycloaddition B) 4π-disrotatory opening of X followed by endo Diels-Alder cycloaddltion C) 4π-conrotatory opening of X followed by exo Diels-Alder cycloaddition D) 4π-disrotatory opening of X followed by exo Diels-Alder cycloadditlon

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Answer & Solution

Answer: Option C

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The IR stretching frequencies (cm^-1) for the compound X are as follows: 3300-3500 (s, br); 3000 (m); 2225 (s); 1680 (s).
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The correct assignment of the absorption bands is

A) \[{\overline {\rm{V}} _{\left( {{\rm{OH}}} \right)}}\] = 3300-3500; \[{\overline {\rm{V}} _{\left( {{\rm{CH}}} \right)}}\] = 3000; \[{\overline {\rm{V}} _{\left( {{\rm{CN}}} \right)}}\] = 2225; \[{\overline {\rm{V}} _{\left( {{\rm{CO}}} \right)}}\] = 1680 B) \[{\overline {\rm{V}} _{\left( {{\rm{OH}}} \right)}}\] = 3000; \[{\overline {\rm{V}} _{\left( {{\rm{CH}}} \right)}}\] = 3300-3500; \[{\overline {\rm{V}} _{\left( {{\rm{CN}}} \right)}}\] = 2225; \[{\overline {\rm{V}} _{\left( {{\rm{CO}}} \right)}}\] = 1680 C) \[{\overline {\rm{V}} _{\left( {{\rm{OH}}} \right)}}\] = 3300-3500; \[{\overline {\rm{V}} _{\left( {{\rm{CH}}} \right)}}\] = 3000; \[{\overline {\rm{V}} _{\left( {{\rm{CN}}} \right)}}\] = 1680; \[{\overline {\rm{V}} _{\left( {{\rm{CO}}} \right)}}\] = 2225 D) \[{\overline {\rm{V}} _{\left( {{\rm{OH}}} \right)}}\] = 3000; \[{\overline {\rm{V}} _{\left( {{\rm{CH}}} \right)}}\] = 3300-3500; \[{\overline {\rm{V}} _{\left( {{\rm{CN}}} \right)}}\] = 1680; \[{\overline {\rm{V}} _{\left( {{\rm{CO}}} \right)}}\] = 2225

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Answer: Option A

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