Some Basic Principles of Organic Chemistry
- In which of the following molecules, all atoms are coplanar? Answer: 4. [structure shown in figure] Key idea: all atoms are coplanar only if every atom is sp2 or sp (no sp3 carbon or its hydrogens). Cy... 1
- Which of the following biphenyls is optically active ? Answer: 2. [structure shown in figure] Key idea: a biphenyl is optically active (shows atropisomerism) only if rotation about the central bo... 1
- The pair of electron in the given carbanion, CH_3C C^, is present in which of the following orbitals ? Answer: 4. sp Key idea: the carbanion carbon in CH₃Cequiv C^- is triply bonded to another carbon, so it has 2 regions of electron density an... 1
- Natural rubber has : Answer: 1. All cis-configuration Key idea: natural rubber is cis-1,4-polyisoprene. All the double bonds in the chain have cis configuration,... 1
- Which of the following is an analgesic ? Answer: 1. Novalgin Key idea: an analgesic relieves pain. Novalgin is an analgesic (and antipyretic). Penicillin, streptomycin and chloromyc... 1