a) The molecule has no optical activity. b) The molecule has an enantiomer. c) T
ID: 693229 • Letter: A
Question
a) The molecule has no optical activity. b) The molecule has an enantiomer. c) The molecule has a mirror plane in the molecule. d) None of the above. 16. What term describes the structural relationship between cis-1,2- dimethylcyclopentane and trans 1,2-dimethylcyclopentane? a) constitutional isomers b) identical c) enantiomers d) diastereomers 17. Which would NOT be a regiospecific reaction of alkene? a) Oxymercuration-demercuration c) Oxidative cleavage d) Free radical reaction of alkene with HBr b) Hydroboration 18. Which solvent is suitable for an Sy2 reaction mostly? a) ethanol b) acetone c) water d) None of them 19. Which one would be the major product of the following reaction? OK a) 2-Methyl-2-pentene c) 2-Methyl-3-pentene b) 3-Methyl-2-pentene d) 3-Methyl-1-pentene 20. Which reaction of alkene would give the alcohol as its product? a) Acid-cat. hydration c) Bromination b) Alkoxymercuration-demercuration d) Free radical reaction with HBr 21. Which of the following compounds will undergo an Swl reaction most readily? 7. Which of the following is the most stable carbocation? A) B) C) D) E) CH3 CH3 O CH2 CH3 CH3 23. 2. What is the name of cl CH Br Page 3 of 7Explanation / Answer
16)option D
cis and trans isomers are diasteromers by definititon. Diasteromers are the stereoisomers which are not mirror images.
17) option C
oxidative cleavage cleaves the double bond thus not regiospecific
Oxymercuration - demercuration is markownikof addition
Hydroboration oxidation is anti Markownikoff addition
freeradical addition of HBr is also anti markownikoff .
All these three are regiospecific.
18) OPtion B
For SN2 either less polar or polar aprotic solvents are preferred
19) option D
bulky bases like t-butoxide favor the HOffman elimination giving least substituted 1-alkenes.
20) OPtion A
Acid catalysed hydration only gives alcohol from alkenes .
Alkoxymercuration-demercuration product is ether.
bromination products is bromide
Free radical additon of HBr also gives bromide
21)option A
tertiary halide is ost reactive for SN1 as it forms stable tertiary carbocation
7) OPtion B
tertiary carbocation is most stable
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