CHEM 2125 midterm (ochem 2 lab)

Identify the one which is the perfect example for Isolated double bond?

1,4 pentadiene

how many reducing equivalents are present in each unit of sodium borohydride NaBH4?

4

Which is unreactive in hydride reduction with NaBH4?

C

which feature represents a carbonyl group?

C=OC=O

identify the statement which is related to Diels-Alder reaction?

Cyclic dienes react very slow than the linear chain dienes

The reactant shown below can follow which type of reaction mechanism

Diels Elder Reaction

Which of these structures is a conjugated diene?

II and IV

A molecule in which more than one single bond separates two double bonds are called as ____________

Isolated double bond

In the major product of a reaction following Markovnikov's rule, the ______ will then end up on the more substituted carbon in a double bond

Nucleophile

which task must be carried out before using a round-bottom flask at the lab bench?

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

identify the items that can be used to control the boiling when heating liquid in a round bottom flask

a stir bar and stir plate boiling chips or stones

Which of the following functional groups is indicated by a strong and broad infrared absorption around 3300 cm-1?

alcohol

what is a heteroatom in an organic compound?

any atom other than C or H

When drying an organic solution, how is it determined that enough drying agent has been added?

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?

as low as possible no more than halfway up

what are the reasons to determine the metling point of a sample in a melting point apparatus?

assessment of the sample's purity identification of an unknown sample

Which class of compound is an example of a carbonyl compound?

b) carboxylic acid

Identify the part of the reflux set-up indicated by each letter in the diagram. A

condenser

Conjugated diene reacts with which among the following to form a cyclohexene

dienophile

Identify the characteristics of a good recrystallization solvent. Select one or more

does not dissolve a sample well at low temperatures dissolves a sample well at high temperatures

Why is sodium borohydride an important reagent in reducing a ketone?

it is a good source of the hydride ion (H)

According to Markovnikov's rule of the electrophilic addition to an alkene, the electrophile, usually a proton, is more likely to add to the __________________ in a double bond

less substituted carbon

which stabilizes it with the presence of _________

more substituents

This arrangemetn places the intermediate carbocation on the __________________

more substituted carbon

Determine whether each alcohol could be a major product of the acid-catalyzed hydration of an alkene. H3C OH CH3

not a possible major product

Determine whether each alcohol could be a major product of the acid-catalyzed hydration of an alkene. H3C OH

not a possible major product

Determine whether each alcohol could be a major product of the acid-catalyzed hydration of an alkene. H3C OH (CH3)2

possible major product

Determine whether each alcohol could be a major product of the acid-catalyzed hydration of an alkene. H3C OH CH3 (up and down)

possible major product

Identify the part of the reflux set-up indicated by each letter in the diagram. B

round bottom flask

Identify the part of the reflux set-up indicated by each letter in the diagram. D

water inlet

Identify the part of the reflux set-up indicated by each letter in the diagram. C

water outlet

when should you replace your gloves in an organic lab?

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