Question

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(A) Enantiomers (B) Diastereomers (C Same Compound (D)Constitutional Isomers (E) meso-compound 5. Which Newman projection represents the most stable conformation of (CH)CHCHCH,)? HyC (A) 6 Which of the following energy diagrams shows a concerted endothermic reaction? 7. Identify the IV (E) V (A) (B) II (C III (D)IV 8. Which compound below has a meso form? A. 1,22 -dichlorobutane butane B. 1,3- dichloro C. 2,3 -dichlo D. 1,4- dichlorobutane 9. Which of the following is the strongest nucleophile in polar protic solvent like water? E)CH30 C Ho B) CIT A) FT 10. How do alkyl substituents stabilize a carbocationic center to which they are attached? A) Through an inductive donation of electron density to the cationic center. B) Through hyperconjugation. the cationic center C) Through an inductive removal of electron density from D) Both A and B

Answer 1

option (c) is most stable conformer of the given molecule since, the steric repulsion of the methyl groups are less has the methyl groups are anti per planar to catch other 6. The the energy diagram for concerted endothermic reaction is: option (d) option (E) V is incorrect step electron flow will be from electron rich to electron deficient species Cl CI Cl Cl Cl 1,4-dichlorobutane CI 1,3-dichlorobutane 1,2-dichlorobutane 2,3-dichlorobutane Meso compound has internal plane of symmetry Hence, 2,3-dichlorobutane and 1,4-dichlorobutane have a meso form 9. A polar parotic solvent can participate in hydrogen bonding with a nucleophile The ability of nucleophiles to participate in hydrogen bonding decreases as we go down the periodic table Hence, the correct answer is option (A) F- 10. (D) Both A and B Through an inductive removal of electron density from the cationic centre and through hyper conjugation