MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why Monomeric saturated aliphatic carboxylic acids show carbonyl stretching frequency near 1760 cm-1, while saturated aliphatic ketones near 1720 cm-1? |
| A. | Mesomeric (M) effect is dominant in acids over the inductive (I) effect |
| B. | I effect is dominant in carboxylic acids over the mesomeric effect |
| C. | I effect on ketones is dominant over the M effect |
| D. | M effect in ketones is dominant |
| Answer» C. I effect on ketones is dominant over the M effect | |
| 2. |
What is the number of vibrational degrees of freedom in C6H5CH3? |
| A. | 39 |
| B. | 15 |
| C. | 18 |
| D. | 40 |
| Answer» B. 15 | |
| 3. |
A compound C8 H6 decolorizes Br2 in CCl4 and gives a white precipitate with Tollen’s reagent. It has sharp band at 3300 cm-l and weak bands at 3085, 2110 cm-l. What is this compound? |
| A. | Phenyl acetylene |
| B. | Phenyl propylene |
| C. | Phenyl ethylene |
| D. | Octene |
| Answer» B. Phenyl propylene | |
| 4. |
Why ketenes absorb in IR at a very high frequency (2150 cm-1)? |
| A. | The inner C is sp hybridized |
| B. | The more s character in a bond, the stronger it is |
| C. | Inner C is sp2 hybridized |
| D. | Inner C is sp3 hybridized |
| Answer» D. Inner C is sp3 hybridized | |
| 5. |
Which compound having molecular formula C5H10 shows absorption at 1380 cm-1? |
| A. | 2-Methyl-1-butene |
| B. | Cyclopentane |
| C. | Pentyne |
| D. | Methylcyclobutane |
| Answer» C. Pentyne | |
| 6. |
Why in the IR spectrum of Benzoyl chloride, a weak band near 1750 cm-1 is formed? |
| A. | Inductive effect |
| B. | Fermi resonance between C = O band and first overtone |
| C. | Conjugation effect |
| D. | Hyperconjugation effect |
| Answer» C. Conjugation effect | |