ECAT Pre Engineering Chemistry Chapter 18 MCQ Test With Answer

In which molecule carbon atom is sp²hybridized

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• None of the above D

Which set of hybrid orbitals has planar triangular shape

• sp³ A
• sp B
• sp² C
• dsp² D

Which of these always applies to a nucleophile

• It attacks a double bond A
• It has a lone pair of electrons B
• It is single atom C
• It is negatively charged D

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

• Three sigma and one P_i A
• Two sigma and two P_i B
• One sigma and three P_i C
• sigma D

Major component of natural gas is:

• Ethane A
• Ethene B
• Propane C
• Methane D

Ether shows the phenomenon of

• position isomerism A
• Chain isomerism B
• Metamerism C
• Cir-trans isomerism D

• Addition Elimination A
• Addition Reduction B
• Elimination Reduction C
• Substitution Elimination D

• Condensation A
• Dehydration B
• Dehydrogenation C
• Hydrogenation D

At present oil refineries in Pakistan are:

• One A
• Two B
• Three C
• Four D

Which statement is true about a free radical

• An atom with a positive charge A
• An atom with a negative charge B
• An atom with a lone pair of electrons C
• An atom with unpaired electron D

The general formula for alkenes is

• C_nH_2n+1 A
• C_nH_2n+2 B
• C_nH_2n C
• C_nH_2n-2 D

Which of the following posses linear geometry

• Alkane A
• Alkene B
• Alkyne C
• Benzene D

In alkynes the bonds between carbon atoms are

• All sigma bonds A
• All pi(π) bonds B
• One is sigma and two areπ(pi) bonds C
• One isπ(pi) and two are sigma bonds D

I-Chloropropane has two isomers, it is an example of

• Chain isomerism A
• Position isomerism B
• Functional group isomerism C
• Metamerism D

The active part in a molecule is called

• Hetroatom A
• Functional group B
• Chemical bond C
• Ion D

Organic compounds resemble to those of inorganic compounds having same

• Ionic properties A
• Carbon forming long chain or rings B
• Chemical forces C
• Isomerism D

Sp³ hybridization occurs when carbon is bound to

• Four other atoms A
• Three other atoms B
• Two other atoms C
• One other atoms D

Compounds having same molecular formula but different structures are said to be

• Monomers A
• Isomers B
• Metamers C
• Tautomers D

• 0 1 A
• 0 2 B
• 1 1 C
• 1 2 D

The state of hybridization of carbon atom in methane is

• sp³ A
• sp² B
• sp C
• dsp² D

Benzene is an example of

• Aromatic compound A
• Cyclic compound B
• Aliphatic compound C
• A cyclic compound D

A double bond consists of

• Two sigma bonds A
• One sigma and one Pi bond B
• One sigma and two Pi bonds C
• Two Pi bonds D

Closed chain compound can be classified into

• Homocyclic A
• Hetrocyclic B
• Aliphatic C
• Both a and b D

Catenation is a process in which carbon shows the properties of making

• Multiple bonds A
• Hybridization B
• Long chains or rings of carbon atom C
• Showing isomerism D

Select from the following the one which alcohol

• 
  A
• 
  B
• 
  C
• 
  D

• 2, 2, 4-trimethylpentane A
• 2, 4, 4-trimethylpentane B
• 2, 4, 4-methyepentane C
• 2, 2, 4-methylpentane D

The bond angle between hydrogen atoms and carbon in alkane is

• 104.5° A
• 107.5° B
• 109.5° C
• 120.5° D

Carboxylic acid, ester, amide and amino groups are shown. Which is the correct description of these functional groups

• 
  A
• 
  B
• 
  C
• 
  D

Quality of fuel is judged from its octane number. The best fuels are

• Straight chain hydrocarbons A
• Branched chain hydrocarbons B
• Cyclic compounds C
• Compounds containing benzene ring D

Ether show the phenomenon of :

• Position isomerism A
• Functional group isomerism B
• Metamerism C
• Cis-trans isomerism D