MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which enolate derived from 1-phenylbutan-2-one is most stable? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9a.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option a" class="alignnone size-full wp-image-224672" height="68" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9a.png" width="166"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9b.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option b" class="alignnone size-full wp-image-224673" height="95" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9b.png" width="153"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9c.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option c" class="alignnone size-full wp-image-224674" height="70" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9c.png" width="163"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option d" class="alignnone size-full wp-image-224675" height="72" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png" width="156"/></a> |
| Answer» D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option d" class="alignnone size-full wp-image-224675" height="72" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png" width="156"/></a> | |
| 2. |
Which is a wrong structure as a resonance contributor to the most stable enolate form of pentan-2,4-dione? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7a.png"><img alt="Wrong structure as resonance to stable enolate form of pentan-2,4-dione - option a" class="alignnone size-full wp-image-224663" height="62" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7a.png" width="111"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7b.png"><img alt="Wrong structure as resonance to stable enolate form of pentan-2,4-dione - option b" class="alignnone size-full wp-image-224664" height="74" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7b.png" width="107"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7c.png"><img alt="Wrong structure as resonance to stable enolate form of pentan-2,4-dione - option c" class="alignnone size-full wp-image-224665" height="63" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7c.png" width="109"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7d.png"><img alt="Wrong structure as resonance to stable enolate form of pentan-2,4-dione - option d" class="alignnone size-full wp-image-224666" height="65" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q7d.png" width="118"/></a> |
| Answer» E. | |
| 3. |
Which enol form of ethyl 3-oxobutanoate is predominant at equilibrium? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6a.png"><img alt="Enol form of ethyl 3-oxobutanoate is predominant at equilibrium - option a" class="alignnone size-full wp-image-224659" height="69" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6a.png" width="143"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6b.png"><img alt="Enol form of ethyl 3-oxobutanoate is predominant at equilibrium - option b" class="alignnone size-full wp-image-224660" height="69" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6b.png" width="133"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6c.png"><img alt="Enol form of ethyl 3-oxobutanoate is predominant at equilibrium - option c" class="alignnone size-full wp-image-224661" height="70" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6c.png" width="143"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6d.png"><img alt="Enol form of ethyl 3-oxobutanoate is predominant at equilibrium - option d" class="alignnone size-full wp-image-224662" height="67" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6d.png" width="132"/></a> |
| Answer» C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6c.png"><img alt="Enol form of ethyl 3-oxobutanoate is predominant at equilibrium - option c" class="alignnone size-full wp-image-224661" height="70" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q6c.png" width="143"/></a> | |
| 4. |
Which of the following is the most stable enolate derived from 4-methylhexan-3-one? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5a.png"><img alt="The following is the most stable enolate derived from 4-methylhexan-3-one - option a" class="alignnone size-full wp-image-224655" height="94" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5a.png" width="132"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5b.png"><img alt="The following is the most stable enolate derived from 4-methylhexan-3-one - option b" class="alignnone size-full wp-image-224656" height="89" sizes="(max-width: 110px) 100vw, 110px" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5b.png 110w, https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5b-100x80.png 100w" width="110"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5c.png"><img alt="The following is the most stable enolate derived from 4-methylhexan-3-one - option c" class="alignnone size-full wp-image-224657" height="96" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5c.png" width="136"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5d.png"><img alt="The following is the most stable enolate derived from 4-methylhexan-3-one - option d" class="alignnone size-full wp-image-224658" height="103" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5d.png" width="108"/></a> |
| Answer» D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5d.png"><img alt="The following is the most stable enolate derived from 4-methylhexan-3-one - option d" class="alignnone size-full wp-image-224658" height="103" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q5d.png" width="108"/></a> | |
| 5. |
A malonic ester synthesis of a carboxylic acid proceeds by alkylation of the enolate of the malonic ester followed by ester hydrolysis and decarboxylation of the -dicarboxylic acid. Which of the following carboxylic acids is difficult to prepare by this method? |
| A. | PhCH<sub>2</sub>CH<sub>2</sub>CO<sub>2</sub>H |
| B. | (CH<sub>3</sub>)<sub>2</sub>CHO<sub>2</sub>H |
| C. | PhCH<sub>2</sub>CO<sub>2</sub>H |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q4.png"><img alt="The following carboxylic acids is difficult to prepare by this method is PhCH2CO2H" class="alignnone size-full wp-image-224654" height="57" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q4.png" width="139"/></a> |
| Answer» D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q4.png"><img alt="The following carboxylic acids is difficult to prepare by this method is PhCH2CO2H" class="alignnone size-full wp-image-224654" height="57" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q4.png" width="139"/></a> | |
| 6. |
An acetoacetic ester synthesis of a ketone proceeds by alkylation of the enolate of the acetoacetic ester followed by ester hydrolysis and decarboxylation of the -ketoacid. Which of the following methyl ketones is difficult to prepare by this method? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3a.png"><img alt="Acetoacetic ester synthesis of ketone proceeds by alkylation of enolate - option a" class="alignnone size-full wp-image-224650" height="65" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3a.png" width="146"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3b.png"><img alt="Acetoacetic ester synthesis of ketone proceeds by alkylation of enolate - option b" class="alignnone size-full wp-image-224651" height="64" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3b.png" width="137"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3c.png"><img alt="Acetoacetic ester synthesis of ketone proceeds by alkylation of enolate - option c" class="alignnone size-full wp-image-224652" height="60" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3c.png" width="178"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3d.png"><img alt="Acetoacetic ester synthesis of ketone proceeds by alkylation of enolate - option d" class="alignnone size-full wp-image-224653" height="60" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3d.png" width="148"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3b.png"><img alt="Acetoacetic ester synthesis of ketone proceeds by alkylation of enolate - option b" class="alignnone size-full wp-image-224651" height="64" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q3b.png" width="137"/></a> | |
| 7. |
Which of the following is the least abundant aldol adduct formed from an equimolar mixture of ethanal and propanone in aqueous NaOH solution? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2a.png"><img alt="Least abundant aldol adduct formed from equimolar mixture in NaOH solution - option a" class="alignnone size-full wp-image-224646" height="64" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2a.png" width="133"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2b.png"><img alt="Least abundant aldol adduct formed from equimolar mixture in NaOH solution - option b" class="alignnone size-full wp-image-224647" height="68" sizes="(max-width: 151px) 100vw, 151px" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2b.png 151w, https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2b-150x68.png 150w" width="151"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2c.png"><img alt="Least abundant aldol adduct formed from equimolar mixture in NaOH solution - option c" class="alignnone size-full wp-image-224648" height="82" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2c.png" width="120"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2d.png"><img alt="Least abundant aldol adduct formed from equimolar mixture in NaOH solution - option d" class="alignnone size-full wp-image-224649" height="84" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q2d.png" width="148"/></a> |
| Answer» E. | |
| 8. |
Which of the following is the structure of the most stable enol form of 2-methylpentan-3-one? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1a.png"><img alt="The following is structure of most stable enol form of 2-methylpentan-3-one - option a" class="alignnone size-full wp-image-224642" height="99" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1a.png" width="115"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1b.png"><img alt="The following is structure of most stable enol form of 2-methylpentan-3-one - option b" class="alignnone size-full wp-image-224643" height="96" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1b.png" width="112"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1c.png"><img alt="The following is structure of most stable enol form of 2-methylpentan-3-one - option c" class="alignnone size-full wp-image-224644" height="97" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1c.png" width="92"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1d.png"><img alt="The following is structure of most stable enol form of 2-methylpentan-3-one - option d" class="alignnone size-full wp-image-224645" height="86" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1d.png" width="111"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1b.png"><img alt="The following is structure of most stable enol form of 2-methylpentan-3-one - option b" class="alignnone size-full wp-image-224643" height="96" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q1b.png" width="112"/></a> | |