1-50
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The following statement is/are true regarding the relationship of bond length and bond polarity except:
As the bond polarity increase, the bond length decreases
The following statement/s is/are true regarding the relationship of hybridization of orbitals and bond length:
As the s character increases, the bond length decreases
BOND STRENGTH or BOND ENERGY is the energy necessary to break the only bond in a diatomic molecule or to dissociate the bonded atoms to their bond state. Which of the following statements is/are true regarding its relationship with orbital hybridization, bond length and bond poarity?
All of the choices
What is the name of the following structure?
3 methyl hexane
What is the name of the following structure? (May double bond)
2 methylpentene
What is the name of the following structure: CH3CH2CH2-C=CH
1- pentyne N-propylacetylene
The following structure is the side chain of amino acid tryptophan. What is the name of the following structure?
Indole
The structure of nucleic acid base cytosine, uracil and thymine is based on following N-ring. What is the name of the following structure?
Pyrimidine
Organic pharmaceuticals are often complex molecules which have a variety of acidic and basic functional groups. The behaviour of these groups in an aqueous environment will influence the activity of the drug and its absorption in the different compartments of the body. Which of the following statement is/are true regarding the pH of the medium and the acidic/basic property of the drug?
All of the above
Which of the following statements is/are true regarding drug distribution and pKa?
• Indomethacin (pKa=4.5) will be absorb from the stomach rather than intestinal mucosa • Ephedrine (pKa=9.6) will be absorb from the intestinal mucosa rather than the stomach
These lipid soluble compounds are also paraffin or saturated hydrocarbons. They commonly undergo halogination and combustion reaction and, in vivo, terminal carbon or side chain hydroxylation may occur.
Alkanes
These lipid soluble compounds are also known as olefins and unsaturated hydrocarbons. Their common reactions are the addition of hydrogen or halogenation, hydration (to form glycols), and oxidation (to form peroxides).
Alkenes
The structure of these compounds is based on benzene. These molecules exhibit multicenter bonding, which confers unique chemical properties
Aromatic hydrocarbon
Which of the following alcohols is the most water soluble?
Methanol
Which of the following statement is /are true regarding oxidation of alcohols?
Tertiary alcohols ordinarily are not oxidized
Which of the following compounds has a general formula of R-O-R with an oxygen bonded to 2 carbon atoms?
Ether
These compounds have a general formula of R-CHO and contain a carbon group (C=O). The common reactions of these compounds are oxidation and hemiacetal and acetal formation.
Aldehydes
Which of the following statements is/are correct about the water solubility of amines?
Branching decreases water solubility Tertiary amines are the least water soluble compared to primary and secondary amines
These compounds have a general formula of RCOOR and commonly undergo hydrolysis to form carboxylic acid and alcohol.
Esters
These compounds have a general formula of RCOOH and commonly undergo salt formation with bases, esterification and decaroxylation.
Carboxylic acid
Which of the following classes of organic compounds reacts to form salts with hydrochloric acid?
Rectangle
Which of the following terms best describes the following reaction: NH2 and Methyl –> Methylbenzyl
Oxidative deamination
Which of the following functional group when added to a benzene nucleus, decreases the lipid solubility of the benzene
Carboxylic acid group and phenolic group
For questions 24-26, refer to the drug molecule :
I is correct (An aqueous base)