Multiple Choice Questions On Organic Chemistry
- The photocycloaddition of ketones to electron-rich alkenes involves an attack on ground state alkene by the n →π* triplet state of the carbonyl compound.
- Photocycloaddition of aliphatic ketones to electron-deficient alkenes particularly involves the addition of singlet state (n → π*) excited ketone to ground state alkene.
- The reaction is stereospecific and the stereochemistry of the alkene is retained in the product.
- None Of These
- 9 : 6: 2
- 2: 4 : 3
- 1: 2: 2
- 3 : 4: 1
- Nitrogenase enzyme
- Catalase enzyme
- Liver alcohol dehydrogenase
i. The chemical properties of diastereomers in the achiral medium are always different
ii. The chemical properties of enantiomers in an achiral medium are different
iii. Enantiomers rotate plane polarised light in the same direction
iv. Geometrical isomers are always enantiomers
- i, ii and iii
- iii and iv
- ii, iii and iv
- i and iv
A) Claisen rearrangement is a [2,3] sigmatropic shift of allyl vinyl ethers in aliphatic as well as aromatic substrates.
B) Claisen rearrangements are stereoselective owing to the chair form transition state.
C) Claisen rearrangement is feasible at room temperature in the presence of Trifluoroethanol.
D) Lewis’s acids can enhance the rate of the reactions and lower the temperature required to bring the transformations.
- B and D
- A and C
- A, B and C
- B, C and D
- Secondary Carbocation
- Tertiary Carbanion
- Secondary radical
- Tertiary CarbocationQuestion 8.
If the carbon being pointed to was deprotonated (resulting in a positive charge on it). Would the resonance form (the positive charge being redistributed to the carbon with bromine) be more stable than a secondary carbocation?
A. No, because bromine's bulky electron cloud will interfere
B. No, because bromine is an electrophile
C. Yes, because bromine is an electrophile
D. Yes, because bromine donates some electrons
Question 9.If you have a 2o carbocation next to a tertiary carbon that has hydrogen, what is the possible shift?
A. 1,2-hydride shift
B. 1,2-alkyl shift
C. Both are possible
D. No shift is observed
Question 10.Which among the following has the highest nucleophilicity?A. F-B. OH-C. CH3-D. NH2-
|Answer Key For Organic Chemistry|
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