ECAT Pre Engineering Chemistry Chapter 18 MCQ Test With Answer

Compounds having the same molecular formula, but different functional groups show

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

The process in which one s and two p orbitals mix up with each other is called

• Sp-hybridization A
• Sp²-hybridization B
• Sp³-hybridization C
• Dsp²-hybridization D

Acetylene had a characteristic ethereal smell resembling that of

• Ginger A
• Vinegar B
• Garlic C
• Onion D

Alkynes normally have ______ hybridization

• Sp A
• Sp² B
• SP³ C
• d sp³ D

The distillation of coal at high temperature and in absence of air is called

• Vacuum distillation A
• Normal distillation B
• Fractional distillation C
• Destructive distillation 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

The active part in a molecule is called

• Homologous series A
• Functional group B
• Chemical bonding C
• Ionic complex 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

The open chain organic compounds are called

• Linear compounds A
• Aromatic B
• Aliphatic C
• Both A and B D

The bond angle between hydrogen atoms and carbon in alkane is

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

Homologues differ from each other by an integral number of

• CH₂groups A
• CH₃groups B
• CH groups C
• CH₄groups D

Benzene is an example of

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

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

Cracking normally gives smaller ______

• Alkanes A
• Alkenes B
• Alkynes C
• Both a and b D

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

Ether shows the phenomenon of

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

The rotation of two carbon atoms joined by double bond would happened only if

• Pi bond is broken A
• Sigma bond is broken B
• Both bonds are broken C
• None of above D

Wohler synthesized first of all the organic compound:

• Carbohydrates A
• Urea B
• Aniline C
• Toluene D

How many structural acid cis-trans isomers are there for dichloroprepe, C₃H₄Cl₂

• 3 A
• 5 B
• 6 C
• 7 D

At present oil refineries in Pakistan are:

• One A
• Two B
• Three C
• Four D

• 1 A
• 2 B
• 3 C
• 4 D

Unsaturated hydrocarbon containing a double bond are called

• paraffin A
• Alkanes B
• Olefins C
• Acetylene D

Which is the chain isomer of n-pentane

• Isopentane A
• Neopentene B
• N-pentene C
• Isopentene D

Coal is obtained from dead remains of

• Plants A
• Animals B
• Both a and b C
• None D

Which of the following is an aromatic compound

• Propanol A
• Cyclohexane B
• Acetone C
• Benezene D

The self linking of carbon atoms is called

• Chelation A
• Isomerism B
• Catenation C
• None of the above 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

Organic compounds are soluble in all except

• Benzene A
• Petroleum B
• Ether C
• Water D

Which of the following gases is used for illuminating purpose?

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

When a compound X is passed through a dilute alkaline solution of KMnO₄the pink colour of solution is discharged. The compound X is possbibly

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