ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES AND TECHNIQUES Quiz-9

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. Which of the following compounds will exhibit geometrical isomerism?

•  1-Phenyl-2-butene
•  3-Phenyl-1-butene
•  2-Phenyl-1-butene
•  1,1-Diphenyl-1-propene

Solution

Q2.

•  A B C
•  B A C
•  C B A
•  C A B

Solution
(c) The larger the stability, the smaller the P.E.; henceI>II>III

Q3.  The smallest aldehyde and its next homologue are treated with NH2OH to form oxime. Find out the correct answer out of the following

•  Two different oximes are formed
•  Three different oximes are formed
•  Two oximes are optically active
•  All oximes are optically active

Solution

Q4.   The IUPAC name of the compound with formula C_n H_(2n+2), having the lowest possible molecular mass and capable of showing enantiomerism, is:

•  3-Methyl hexane
•  2,3-Dimethyl pentane
•  Methane
•  Both (a) and (b)

Solution
Part D

Q5.

•  Propane-1,2,3-tricarbonitrile
•  3-Cyanopetane-1,5-dinitrile
•  Pentane-1,3,5-trinitrile
•  All

Solution
 Part A

Q6. The optically active tartaric acid is named as D-(+)-tartaric acid because it has apositive

•  Optical rotation and its derived from D-glucose
•  pH in organic solvent
• Optical rotation and is derived form D-(+)-glyceraldehyde
•  Optical rotation when substituted by deuterium

Solution
(c) The symbol D denotes the relative configuration of (OH) group w.r.t. glyceraldehydes taken as standard. Also, (+) sign refers to optical rotation and is dextrorotatory

Q7.Which of the following compounds has isopropyl group?

•  2,2,3,3-Tetramethyl pentane
•  2,2-Dimethyl pentane
•  2,2,3-Trimethyl pentane
•  2-methyl pentane

Solution
Part D

Q8.The type of isomerism exhibited by the compound with formula C4H10O is:

•  Chain and position
•  Functional and position
•  Metamerism
•  Chain, position, functional, and metamerism

Solution

Q9.Lassigne's test is used for the detection of:

•  N, S, and halogens
•  C, H, and P
•  C, H, and O
•  C, S, and P

Solution
(a)
It is the test for N, S and halogens. Phosphorous is detected by another method

Q10. 

•  (III)>(IV)>(II)>(I)
•  (IV)>(III)>(I)>(II)
•  (III)>(II)>(I)>(IV)
• (II)>(III)>(IV)>(I)

Solution
(a)
A carboxylic acid is stronger acid than phenol, hence both III and IV are stronger acids than both I and II. Also IV has a methyl group that gives electrons donating inductive effect and decreases the acid strength. Therefore, III is stronger acid than IV. Between I and II, the dominate electron withdrawing inductive effect of chlorine increases acid strength of phenol slightly, hence II is stronger of phenol slightly, hence, II is stronger acid than I. Thus, the overall order is: (a) III>IV>II>I.