PDF Questions Organic 2 Lab Midterm

What is the major organic product obtained from the following reaction? 1 2 3 4

3

How many reducing equivalents are present in each unit of sodium borohydride, NaBH4NaBH4 1 2 3 4

4

Which task must be carried out before using a round-bottom flask at the lab bench? Select one: · Hot flasks must be allowed to cool to room temperature. · A stir plate should be set up and plugged in. · A large area of the bench must be cleared in case the flask begins to roll. · A proper support, such as a cork ring, should be set in place.

A proper support, such as a cork ring, should be set in place.

Identify items that can be used to control the boiling when heating liquid in a round bottom flask. Select one or more: · A stir bar and stir plate · A Bunsen burner · A rubber stopper or cork · Boiling chips or stones

A stir bar and stir plate Boiling chips or stones

When drying an organic solution, how is it determined that enough drying agent has been added? All drying agent in the flask will become a powder. · All drying agent in the flask will clump up. · All drying agent in the flask will dissolve. · Any newly-added drying agent remains a powder, instead of clumping up.

Any newly-added drying agent remains a powder, instead of clumping up.

When working in a fume hood, what is the best position of the hood sash? Select one: · At eye level · As high as possible, to the top of the hood · Completely closed · As low as possible, no more than halfway up

As low as possible, no more than halfway up

What are the reasons to determine the melting point of a sample in a melting point apparatus? Select one or more: · Assessment of the sample's purity · Identification of an unknown sample · Removal of impurities from the sample

Assessment of the sample's purity Identification of an unknown sample

Which feature represents a carbonyl group? Select one: C=OC=O · C−ClC−Cl · O−HO−H · C−O

C=OC=O

Identify the characteristics of a good recrystallization solvent. Select one or more: · Dissolves a sample well at low temperatures. · Does not dissolve a sample well at high temperatures. · Does not dissolve a sample well at low temperatures. · Is not an organic liquid with a low boiling point. · Dissolves a sample well at high temperatures.

Does not dissolve a sample well at low temperatures. Dissolves a sample well at high temperatures

5. Which of these structures is a conjugated diene? a. I and III b. I, III, V c. II and IV d. II, IV, V e. All of these structures are conjugated dienes

II and IV

When should you replace your gloves in an organic lab? Select one or more: · When the gloves have been exposed to a solvent · When you handle a new piece of glassware · When you mix two chemicals in the lab · When there is any visible tear in the gloves

When there is any visible tear in the gloves When the gloves have been exposed to a solvent

Identify the one which is the perfect example for Isolated double bond? a) 1,4 pentadiene b) 1,2 pentadiene c) 1,3 pentadiene d) 1,5 butadiene

a) 1,4 pentadiene

Which of these molecules could not be made using a Diels-Alderreaction? a b c d

b

The reactant shown below can follow which type of reaction mechanism a) Williamson ether synthesis b) Diels Elder Reaction c) Markovnikov addition d) Anti-markovnikov addition

b) Diels Elder Reaction

Conjugated diene reacts with which among the following to form a cyclohexene? a) Phenol b) Dienophile c) Hexane d) Tribromo phenol

b) Dienophile

A molecule in which more than one single bond separates two double bonds are called as ____________ a) Coordinate bond b) Isolated double bond c) Cumulative double bond d) Conjugated double bond

b) Isolated double bond

Why is sodium borohydride an important reagent in reducing a ketone? a) It is good for hydrolysis type reactions b) It is a good source of the hydride ion (H-) c) It can act as a base d) It can act as a free radical initiator.

b) It is a good source of the hydride ion (H-)

Which class of compound is an example of a carbonyl compound? a) alcohol b) carboxylic acid c) alkene d) alkane

b) carboxylic acid

Which is unreactive in hydride reduction with NaBH4? a b c d

c

Identify the statement which is related to Diels-Alder reaction? a) It is very stereospecific b) Molecular distortion takes place c) Cyclic dienes react very slow than the linear chain dienes d) Addition of maleic anhydride to cyclopentadiene causes diene and dienophile to produce different products

c) Cyclic dienes react very slow than the linear chain dienes

Which pairing of diene and dienophile would lead to the product shown? a b c d

d

Which of the following functional groups is indicated by a strong and broad infrared absorption around 3300 cm-1? a. Carbonyl b. Alkene c. Alkane d. Alcohol e. Amined.

d. Alcohol

What type of alcohol formation will be favored by the hydration of an alkene primary secondary teritiary

secondary

What is a heteroatom in an organic compound? Select one: · The central C atom in the carbon chain. · The C atom at the end of the longest chain · Any atom other than C or H · Any Group 17 element such as chlorine, fluorine, or bromine

· Any atom other than C or H ·