Alkanes: conformations, halogenation mechanism
- How many products (including stereoisomers) are expected from monochlorination of the following compound?(CH_3)_2CH-CH_2-CH_3 Answer: 4. 6 Key idea: count the distinct kinds of hydrogen in 2-methylbutane, then count stereoisomers. Two equivalent CH₃ on C-2: 1-chloro... 1
- Dihedral angle of least stable conformer of ethane is : Answer: 4. 0^° Key idea: the eclipsed conformation of ethane has the highest torsional strain, so it is least stable. In the eclipsed form t... 1
- Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is Answer: 4. CH ₄ The alkyl bromide undergoes Wurtz coupling, mathrm2R-Br+2Na→ R-R+2NaBr . The product has twice the carbon count of R, and mu... 1
- With respect to the conformers of ethane, which of the following statements is true ? Answer: 3. Both bond angles and bond length remains same Key idea: conformers differ only by rotation about the C-C single bond. Staggered a... 1
- The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is : Answer: 4. The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional s... 1