Organic Chemistry

Question 1

An organic compound formed when an acid reacts with an alcohol.

Answer 1

ester

Question 2

Hydrogenation of an alkene yields _________

Answer 2

alkane

Question 2

The simplest ketone is _________

Answer 2

acetone

Question 3

The acid responsible for the irritating sting of ants.

Answer 3

formic acid

Question 3

An aldehyde that smells like green apple is ________

Answer 3

ethanal

Question 4

In which reaction of alkyne can keto-enol tautomerism exist?

Answer 4

Ozonolysis

Question 4

Which of the following physical properties differ for each pair of enantiomers?

Answer 4

Direction of rotation of plane-polarized light

Question 5

Number of double bonds in geraniol

Answer 5

2

Question 6

Whatever the compound, the gram molecular weight contains the same number of molecules, known as Avogadro’s number. It is expressed as:

Answer 6

6.02x10^23 particles per mole

Question 6

All of the following are o- and p- directing substituents EXCEPT

Answer 6

-NO2

Question 6

Which of the following functional groups is present in the melamine molecule?

Answer 6

amine

Question 6

How many isomers does xylene have?

Answer 6

3

Question 6

Which of the following objects are chiral (assume that there is no label or other identifying mark)

a) Pair of scissors
b) Tennis ball
c) Paper clip
d) Beaker
e) The swirl created in water as it drains out of a sink or bathtub

Answer 6

chiral, achiral, achiral, achiral, chiral

Question 7

Fatty acid such as lauric acid and palmitic acid and oleic acid are long unbranched carboxylic acids consisting of 12 to 20 carbon atoms. Which type of fatty acid should people avoid ingesting, saturated or unsaturated and why?

Answer 7

Saturated, because the risk of cardiovascular disease is increased

Question 8

Propanoic acid and methyl acetate are constitutional isomers, and both are liquids at room temperature. One of these compounds has a boiling point of 141°C; the other has a boiling point of 57°C. Which compound has a higher boiling point?

Answer 8

(1) propanoic acid

Question 8

O2 gas effused through a pinhole in 5 sec. How long will it take an equivalent amount of CO2 to effuse under the same conditions?

Answer 8

5.9 s

Question 9

The rate of nucleophilic substitution reaction of tert-butyl bromide with OH– is found to be independent of the concentration of OH– at any instant. It can be inferred that the reaction is:

Answer 9

First-order (SN1)

Question 9

Waxes are

Answer 9

Fatty acids alcohol esters

Question 9

Styrene undergoes ozonolysis to yield two carbonyl compounds. Which of the following pairs is produced by this reaction?

Answer 9

Benzaldehyde and formaldehyde

Question 10

Reduction of ethyl cinnamate using LiAlH4 produces the alcohol

Answer 10

3-phenylprop-2-en-1-ol

Question 11

Which of the following compounds is not aromatic?

Answer 11

Tetrahydrofuran

Question 11

Palmitate has 16 carbon atoms with
1. 2 d. bonds
2. 1 d. bond
3. 3 d. bonds

Answer 11

none of these

Question 11

Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an __________

Answer 11

series

Question 12

Which of the following is a ketone?

Answer 12

CH3COCH3

Question 13

Hydrogenation of one mole of allene (CH2=C=CH2) with 2 moles of hydrogen gas in the presence of Lindlar catalyst yields

Answer 13

propane

Question 14

All of the following contains carbonyl group EXCEPT

Answer 14

ether

Question 15

Friedel-Crafts acylation of benzene with acetyl chloride in AlCl3 yields

Answer 15

acetophenone

Question 15

Which of the following is not an aliphatic hydrocarbon?

Answer 15

toluene

Question 16

Which of the following contains sp-hybridized carbon?

Answer 16

C5H8

Question 17

Vinylbenzene is also known as

Answer 17

styrene

Question 17

Oxidation of isopropyl alcohol with KMnO4 yields

Answer 17

acetone

Question 18

Which of the following alcohols will undergo bimolecular nucleophilic substitution?

Answer 18

all of these: 2-propanol, 1-propanol, 2-methyl-2-propanol

Question 19

In Williamson synthesis of methyl isopropyl ether, the alcohol used is

Answer 19

isopropanol

Question 20

Hydrocarbon derivatives used as a main ingredient in automobile antifreeze

Answer 20

ethylene glycol

Question 21

The following reagents will give an alkyl halide from an alcohol EXCEPT

Answer 21

NaCl

Question 21

Carbonyl compounds can be obtained by reduction using the following except

Answer 21

nitrile

Question 22

Hexanedionic acid is also known as

Answer 22

adipic acid

Question 22

Hydrogenation of alkenes in the presence of a poisoned Pd catalyst produces

Question 22

Reaction of alcohol and a carboxylic acid is known as

Answer 22

esterification

Question 23

Which of the following alkanes is gas at room temperature?

Answer 23

propane

Question 24

Same chemical formula but different in geometric/structural orientation

Answer 24

isomerism

Question 25

Which of the following straight-chain alkanes can be conveniently prepared by Wurtz reaction?

Answer 25

icosane

Question 26

In the Grignard synthesis of an alkane using sec-butyl bromide, which of the following alkane will be produced?

Answer 26

n-butane

Question 27

In nucleophilic addition reactions of alkenes with HZ in which nucleophile Z attaches to more alkyl-substituted carbon and the H attaches to the carbon that already has the greater number of H atoms, the rule being followed by the reaction is

Answer 27

Markovnikov's rule

Question 28

Addition of hydrazine to carbonyl compounds produces a/an

Answer 28

hydrazone

Question 29

Addition of an alcohol to acyl halides produces

Answer 29

ester

Question 30

Cyclic esters are known as

Answer 30

lactones

Question 31

In each case, tell whether the bond is ionic, polar covalent, or nonpolar covalent: Br2, BrCl, HCl, SrF2, SiH4, CO, N2, CsCl

Answer 31

nonpolar covalent, nonpolar covalent, polar covalent, ionic, nonpolar covalent, polar covalent, nonpolar covalent, ionic