ORGANIC AND LABORATORY CHEMISTRY

Solvent extraction is more effective when the extraction is repeated with

The insoluble impurities during recrystallization are removed by

Calculate the percent yield if 0.85 g of aspirin is produced in the reaction of 1.00 g of salicylic acid with excess acetic anhydride. (no. 43 reviewer)

During recrystallization, 0.85 g of crude aspirin was dissolved in a suitable solvent and after filtration and drying, 0.68 g of crystals were recovered. Calculate the % recovery.

Which of the following is NOT separated using distillation?

Steam baths are often used to heat volatile, non-aqueous, flammable solvents because of the following EXCEPT

The beads in a fractional column are for

Fractional distillation is a process of separation of which of the following?

What is the advantage of steam distillation?

Which of the following is NOT true about steam distillation?

Which of the following is the correct way to determine the boiling point of an unknown compound?

The principle of TLC is that

Which of the following statements about visualization during TLC is TRUE?

Amino acids can be detected by spraying the stationary phase with ninhydrin solution. This can be done in

A substance is analyzed by paper chromatography, giving the chromatogram shown. What is the Rf value of the substance represented by the spot at 8.0 cm?

Karl Fischer titration, which determines trace amounts of water in a sample, uses which electrochemical method?

Which of the following is NOT a common method used for purification?

Method of passing the sample through a metal or plastic mesh of a uniform cross-sectional area to separate particles into uniform sizes.

In the decomposition and dissolution of solids during sample preparation, which of the following is expensive and often the last resort?

Sample preparation technique used prior to instrumental analysis of metals.

In handling acid wastes, what type of protective gloves should be used?

The following are the minimum requirements for hazardous waste storage facilities EXCEPT

It is a hazardous waste characteristic which applies to wastes that have the potential to contaminate groundwater if improperly disposed of. These materials are regulated as hazardous waste due to their potential to leach out specific toxic substances in a landfill.

What should you do when a waste container has a minor leak?

According to NFPA, what color refers to flammability?

Which of the following can be disposed down the drain?

The following are good sampling practices EXCEPT

Organic peroxides are dangerous when

When using a fume hood, all of the following must be done EXCEPT

According to the GHS, which of the following is NOT under the pictogram “Gas Cylinder”?

A technical document, which is GHS compliant, that contains all the information related to the health hazard, storage, precautionary measures, emergency procedures, etc. when handling chemicals.

Chromatography is used to

Which type of chromatography is used for structural analysis?

Which of the following can be separated using column chromatography?

Affinity chromatography is used for the analysis and isolation of

Which of the following is useful for the separation of low molecular weight gases?

The analysis and separation of industrial products like soap and synthetic detergents is done using

Ion exchange particles carry fixed positive or negative charges. A sulfonic acid type resin has SO3–H+ groups were H+ can be exchanged for

A graph showing the detector’s response as a function of elution time, band’s shapes, position, and resolution.

A technique for separating mixtures into their components in order to analyze, identify, purify, and/or quantify the mixture or components.

Which of the following is NOT an application of high performance liquid chromatography?

Quantitative analysis can be done using

Which of the following statements about spectroscopic methods is correct?

Which of the following demonstrates proper drying of cuvette?

Which of the following is NOT a limitation of Beer-Lambert’s law?

A graphical representation of measuring signal as a function of quantity of analyte.

Which of the following compounds would show the longest wavelength max in its UV spectrum? (see mock exam no. 57)

Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed?

Which of the following molecules will NOT show an infrared spectrum?

In the past, IR spectra had to be acquired one wavelength at a time, which took a long time. Today spectra can be acquired faster due to the

What compound is possibly shown in an infrared spectrum with peaks of 3000 and 1650 cm-1?

NMR spectroscopy indicates the chemical nature of the __________ and spatial positions of __________.

In which species are all the carbon atoms sp2 hybridized?

What is the hybridization of the carbon atom in a carboxyl group?

In which species Is the carbon-nitrogen bond the shortest? (SEE MOCK EXAM NO. 65)

How many different compounds have the formula C5H12?

How many different alcohols (not including stereoisomers) have the molecular formula C₄H₁₀O?

For which compound are the empirical and molecular formulas the same?

Which is the correct molecular formula of the following molecule? (SEE MOCK NO.69)

Which is the correct IUPAC name of the following compound? (SEE MOCK NO.71)

Identify the incorrect statement regarding cycloalkanes.

Which has the highest boiling point? (SEE MOCK NO.73)

Which of the following reactions will consume the most oxygen?

Which set of reagents can perform the following reaction? (SEE MOCK NO. 75)

Which of the following is NOT a reagent for hydrogenation of an alkyne?

When ethyne is subjected to ozonolysis, what is the end product?

Which of the compounds below will react readily with chlorine by addition? I. C2H2 (ethyne) II. C2H4 (ethene) III. C6H6 (benzene)

What is the order of reactivity of the following compounds in EAS? I. benzene II. toluene III. phenol IV. benzoic acid

What are the reagents needed in bromination of benzene via EAS?

Which of the following is NOT true for SN1 reactions?

A low concentration of nucleophile favors

Which statement(s) about substitution reactions are correct? I. The reaction between NaOH and 1-chloropentane predominantly follows an SN2 mechanism II. The reaction between NaOH and 2-chloro-2-methylbutane predominantly follows an SN2 mechanism. III. The reaction between NaOH with 1-chloropentane occurs at a slower rate than with 1-bromopentane

Which of the following alcohols would be most soluble in water?

Which compound is a tertiary alcohol? (SEE MOCK N0. 85)

The gentle oxidation of ethanol produces which of the following product?

The major reason that phenol is a better Bronsted acid than cyclohexanol is

Which compound is NOT an ether? (SEE MOCK NO.88)

Which compound is NOT an aldehyde? (SEE MOCK NO. 89)

What is the IUPAC name for CH₃CH₂CH₂CH₂CHO?

Which of following Is produced when hydrogen is reacted with 2-butanone? (NO ANSWER)

Which of these compounds contain a carboxy group?

The smell of rancid butter is due to the presence of butyric (butanoic) acid. What is the formula for this compound?

Which family of compounds is most frequently used as flavoring agents?

Calculate the percent yield when 0.5 mol of acetic acid reacts with 1 mol of alcohol produces 0.25 mol of ethyl acetate.

Which compound is a tertiary amine? (SEE MOCK N0. 96)

Which of the following compounds are basic?

The most notable difference between a saturated and an unsaturated fat containing the same number of carbon atoms is that the saturated fat

When proteins are broken down, they are converted to

Molecular oxygen is highly soluble in the blood because

Water is soluble solvent for the recrystallization of benzoic acid. How should be addition of the solvent?

The organic liquid in steam distillation vaporizes at

Column chromatography is based on the principle of

The components of the mixture in the column chromatography are eluted in order of

A simple fractional tube is packed with which of the following?

The chromaplate or thin layer chromatography plate is made up of

Retardation factor is the ratio of

Which of the following is FALSE regarding galvanic cells?

A cell is prepared by dipping a copper rod in 1 M CuSO4 solution and an iron rod in 2 M FeSO4 solution. Identify the anode and cathode.

Beer’s Law states that

Which of the following is the principle of Atomic Absorption Spectroscopy?

Which of the following statements about mass spectroscopy is(are) correct?

The region of electromagnetic spectrum for NMR is

Which of the following is(are) application(s) of ion exchange chromatography?

Which of the following is widely used for the separation of specific biomolecules? This relies on the highly specific binding between an analyte and its counterpart.

What must be done to the solid samples for it to be introduced into the column without using solid injection syringes in gas chromatography

Which of the following is NOT an ideal characteristic of a detector used in gas chromatography?

Which of the following detectors is widely used to detect environmental samples like chlorinated pesticides and polychlorinated biphenyls?

Which of the following is NOT true about the guard column used in liquid chromatography?

Which of the following are not used in liquid or high performance liquid chromatography?

Which treatment method is NOT typically used to remove organic compounds?

Segregation of waste organic solvents is very important because

Which method is considered an unacceptable means of disposing waste?

Which is the correct procedure for mixing acid and water?

Which of these compounds exist as cis and trans isomers?

Which compound will rapidly decolorize CHCl3 ?

Baeyer’s reagent is used to characterize alkenes. Which of the following is Baeyer’s reagent?

In what way does the reactivity of CH3C☰CH differ from CH3CH=CH2 ?

Which of the following is an aromatic compound?

Which of the following is the most activating in electrophilic aromatic substitution?

Which of the following is the rate determining step in electrophilic aromatic substitution?

Which of the following CANNOT be a product of the reaction of benzene with CH3Cl and AlCl3 ?

Alkyl halides are very reactive towards nucleophiles because

SN2 means

Which of the following alkyl halides can undergo both SN1 and SN2 reactions?

Which of the following reactions are favored by polar aprotic solvent?

Which compound has the highest boiling point?

Which of the following reactions will NOT produce aldehydes?

Carbon is found in the highest oxidation state in which of these classes of organic compounds?

Which reaction could occur between acetic acid and ethanol?

Which of the following reactions can be used to distinguish between phenol and carboxylic acids?

Under the Bronsted concept of acids and bases, a base is