CHEM 102 (ICH 102) Past Questions and Answers (Updated)

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1.

The ability of carbon to catenate is due to its _____A. Tetrahedral and covalent nature
B. Hybridization ability
C. Ability to form multiple bonds
D. Non-solubility in water.

Answer: A

2.

ICH 102 EXAM QUESTION 2

During covalent bonding, electron sharing imparts stability to the bond formed by____?A. Lowering the energy’s state
B. Increasing the repulsion of electrons
C. Decreasing the replusion of electrons
D. Polarizing the bond.

Answer: A

3.

ICH 102 EXAM QUESTION 3

A distortion effect in covalent bonds caused by large difference in electronegativities of bonding atoms is called____?A. Induced effect
B. Polarization
C. Localization
D. Bond order

Answer: B

4.

ICH 102 EXAM QUESTION 4

_____type of bond is formed by the interaction of two unhybridized orbitals?A. Paired bond
B. sigma bond
C. Polar bond
D. Pi-bond
Answer: D

5.

ICH 102 EXAM QUESTION 5

Benzene can be synthesised fromA. phenol
B. ethanol
C. butanol
D. All of the above

Answer: A

6.

ICH 102 EXAM QUESTION 6

Which of the following carbonyl compounds is the most reactive?

A. ester
B. carboxylic acid
C. acid chloride
D. acid bromide

Answer: C

7.

ICH 102 EXAM QUESTION 7

The fastest leaving group from any carbonyl compound is ____

A. – OR

Answer: D

8.

ICH 102 EXAM QUESTION 8

What class of alcohol is phenol?

A. primary
B. secondary
C. tertiary
D. none of the above

9.

ICH 102 EXAM QUESTION 9

To convert alcohols to alkyl halides, one of these reagents cannot be used.A. ���
B. PCl3
C. Br2
D. SOCl2

Answer: C

10.

The major product of major product Wohler synthesis is ____?A. ��4���
B. H2NCONH2 
C. K2SO4
D. (NH4)2CO

Answer: B

11.

The functional group of Alkanol is ______HIDE ANSWER

ANSWER: Hydroxyl group –OH

EXPLANATION

You have heard of Alkanes right? Good

Remember that the general molecular formular of Alkanes is CnH2n+2,am I right? yes…Good

This means that ethane with two carbon will be C2H6…… Do you understand? The 6 there is from (2×2+2)since our n=2

Now ,if you remove one hydrogen atom from Alkanes and replace it with -OH (hydroxyl group),you will form Alkanols

For instance,ethane is C2H6 but ethanol is C2H5OH,understood?yes

Alkanols are hydroxyl derivatives obtained by replacing one or more hydrogen atom of a hydrocarbon.

The general molecular formula is���2�+1��

12.

The simplest organic compounds are _____HIDE ANSWER

ANSWER: Hydrocarbons

EXPLANATION

Hydrocarbons are compound containing hydrogen and carbon only.

They include

• Alkanes
• alkenes
• alkynes
• benzene

13. Some compound that sublime usually have _____HIDE ANSWER

NSWER: triple point below the room temperature

EXPLANATION

Have you placed camphor in your bag and after some days,you observed it’s no longer there

The solid substance changed directly into gaseous state….that is what is called sublimation

Example of substance that can sublime are :

• ammonium chloride (NH4CL)
• Iodine
• Naphthalene 

14. 2-methyl propan-2-ol is an example of _____ type of AlkanolHIDE ANSWER

ANSWER: tertiary Alkanol

EXPLANATION

Recall that an Alkanol is a hydroxyl derivative of Alkane right? Yes..

Alkanols containing only one hydroxyl group are known as monohydric Alkanols ; “Mono” means one(1), do you understand? Yes

Now listen, monohydric Alkanols are of three types:

• primary
• secondary and
• tertiary.

In tertiary Alkanol the hydroxyl group is on the carbon atom with no hydrogen atom ,….It is attached to three alkyl group eg

• 2–methyl propan–2-ol
• 2–methyl butan– 2-ol
• 3–methyl pentan –3-ol

15.

The melting point of a pure compound varies  (True or false)HIDE ANSWER

ANSWER: False

EXPLANATION

   when we say that something is pure;it simply means there are no impurities.

 How do we confirm that a substance is pure?

well, there are criteria for purity of organic compounds. They include

• melting point for solids
• boiling point and
• refractive index

The presence of an impurity lowers the melting point of a compound and the melting point of that substance varies

A pure solid has a sharp melting point

NOTE: The most common liquid used in melting point determination is liquid paraffin

16.

Metal carbides and trioxocarbonate (iv)are studied under organic compounds . True or False

ANSWER: false

EXPLANATION

  It is true that organic chemistry has been defined as the chemistry of carbon and it’s compounds but there are some compound of carbon that are excluded. They include

• trioxocarbonate (iv)e.g H2CO3, Na2CO3

• hydrogen trioxocarbonate,e.g.NaHCO3

• oxides of carbon e.g CO2 

• metal carbides e.g CaC2

17.

The ability of carbon to form long chain or branched chain is called ____HIDE ANSWER

ANSWER : catenation

EXPLANATION

Carbon atoms can form chains or rings of all sizes . This unique property of carbon is known as Catenation

The ability of carbon to catenate is due to its tetrahedral structure

18.

The organic reagents that can be used as oxidizing agent are ______ & _____HIDE ANSWER

ANSWER:����4����2��2�7

19. The acid present in vinegar is _____HIDE ANSWER

ANSWER : Acetic acid

EXPLANATION

Acetic acid is also called ethanoic acid ,CH3COOH. It is found in vinegar and it has a pungent smell

20.

An organic compound containing a carbon-metal bond is generally called ____ HIDE ANSWER

ANSWER: Organometallic compound

21.

Organic compounds exhibit slow reaction relative to inorganic compounds because they exist as ____ HIDE ANSWER

ANSWER: covalent compound

22.

Oxy-ethyne flame is used for ____ HIDE ANSWER

ANSWER: welding

23.

Breaking of high molecular mass alkanes to generate lower molecular mass alkanes is generally called ____HIDE ANSWER

ANSWER: cracking 

24.

Complete oxidation of primary alkanols gives ____ HIDE ANSWER

ANSWER: alkanoic acids

25.

The reaction between alkanols and alkanoic acids yield _____ HIDE ANSWER

ANSWER: alkanoates (esters )

26.

Solubility of ethanol in water is because it contains ______ and _____ HIDE ANSWER

ANSWER: hydroxyl ion and hydrogen bond

The promotion of electrons from orbitals of lower energy to orbital of higher energy is called _____ HIDE ANSWER

ANSWER: excitation

27.

The empty space in between two concentric spheres of the s-orbital is called ____ HIDE ANSWER

ANSWER: spherical nodal surface