1. The base pairs present in DNA are: a. A…A and T…7 b. R…T and G…C c. A.,.C and G…7 d. A…D and C…7 e. A..,A and C.,,C 2. Which one of the following alcohols undergoes behydration at the fastest rate on being heated with sulfuric acid? a, 1-Hexanol b. 1-Ethylcyclohexanol c. Cyclohexanol d. 4-Methyl-2-hexanol e. 4-Methyl-1-hexanol
5. Which pair of compounds are constitutional isomers? a. Cyclopentane and Methylcyclopentane b. 3-Ethylpentane and 2,2,3-Trimethylbutane c. 3-Methylpentane and 3-Methylhexane d. Propane and Cyclopropane 6. What islare the major product(s) of the following reaction? oll CH3MgBr + HOCH2SH ——+ a. oij-9 ” ll I{oc}t2ccH2MgBr + H2 Ho–cH2ccll3 + rit’Igtsr b.il od.fr Brr4gcn2cll + cH3oH cH4 + Brl4gOGll2cH OMgBr I e. sNH2cHI cH3 7. To complete the conversion shown below, what reactants would be the most suitable? Br-, I a. HBr, peroxides b. NaBr, H2SO4, heat c. Br2, light and heat d, HBr, heat .v
8;. Which of the following groups has the highest priority when ranking the groups or atoms bonded to the asymmetric center? a, 0il -f*tr{li3 -oH -O-CH3 0 dll{*sti e. b. c. fr fi L-J:I 9. Classify these compounds fFi3 CHaCHNHCHzCH3 I (