ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES Quiz-1

Chemistry Aptitude Quiz

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. How many chiral compound are possible on mono chlorination of 2-methyl butane?

•  2
•  4
•  6
•  8

Solution

Q2.Forty millilitre of CO was mixed with 100 ml of O_2 and the mixture was exploded. On cooling, the reaction mixture was shaken with KOH. What volume of gas is left?

•  60ml of O2
•  80ml of O2
•  20ml of CO
•  40 ml of CO2

Solution

Q3.  A certain compound has the molecular formula X4O6. If 10 gm of X4O6 has 5.72 gm X, the atomic mass of X is:

•  32 amu
•  37 amu
•  42 amu
•  98 amu

Solution

Q4. The number of σ- and π-bonds in 5-oxohexanoic acid, respectively, is:

•  18,2
•  18,1
•  17,2
•  17,1

Solution

Q5. An organic compound contains 4% sulphur. Its minimum molecular weight is:

•  200
•  400
•  800
•  1600

Solution
 

Q6. 

•  4-bromo-3-cynophenoal
•  2-bromo-5-hydroxybenzonitrile
• 2-cyano-4-hydroxybromobenzene
•  6-bromo-3-hydroxybenzonitrile

Solution

Q7. An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be

•  Optically active mixture
•  Pure enantiomer
•  Meso compound
•  Racemic mixture

Solution
(a) When optically active acid reacts with racemic mixture of an alcohol, it forms two types of isomeric esters. In each, the configuration of the chiral centre of acid will remain the same. So, the mixture will be optically active.

Q8.Which of the following is a soft base?

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Solution
(a) When optically active acid reacts with racemic mixture of an alcohol, it forms two types of isomeric esters. In each, the configuration of the chiral centre of acid will remain the same. So, the mixture will be optically active.

Q9. A compound (A) with molecular formula C5 H10 gives one monochlorination product. Compound (A) is:

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•  
•  
•  

Solution

Q10. Which of the following carbocations is least stable?

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Solution
(b) Positive charge on sp-hybridised C atom