MCQs Set VII - Isomerism

(1)   An isomer of ethanol is

(a)     Methanol

(b)     Acetone

(c)     Dimethyl ether

(d)     Diethyl ether

(2)   How many chain isomers can be    obtained from C₆H₁₄—

(a)     4                     

(b)     6

(c)     5                     

(d)     7

(3)   The compound C₄H₁₀O can show-

(a)     Metamerism

(b)     Functional isomerism

(c)     Position isomerism

(d)     All of the above

(4)   Compound that is not isomeric with Diethyl ether is –

(a)     2-Methoxy propane

(b)     Butanol

(c)     2-Methyl-2-propanol

(d)     Butanone

(5)   Compounds that can exhibit geometrical isomerism—

(a)     2-Butene

(b)     2-Butanol

(c)     2-Butyne

(d)     2-Methyl-1-propene

(6)   Optical isomerism is shown by-

(a)     Butanol       

(b)     Butene

(c)     Butanol        

(d)     Butene

(7)   Chiral molecules are those which are-

(a)     Superimposable mirror images

(b)     Non superimposable on their mirror image

(c)     Capable of forming isomers

(d)     Unstable molecules.

(8)   Minimum condition for a molecule to show optical isomerism is-

(a)     Presence of an asymmetric carbon atom

(b)     Dissymmetry in the molecule

(c)     Presence of plane of symmetry

(d)     Restricted rotation

(9)   Keto-enol tautomerism is observed in—

(a)     Benzaldehyde

(b)     Benzophenone

(c)     Acetophenone

(d)     Acetic acid

(10)  Which of the following can deflect plane of polarized light

(a)     2-Methylpropanoic acid

(b)     Butanoic acid

(c)     2- Methylbutanoic acid

(d)     Propanoic acid

(11)   Optical isomers, which are not mirror images of each other, are called

(a)     Enantiomers

(b)     Diastereoisomers

(c)     Epimers

(d)     Anomers

(12)    Functional isomers that exist in dynamic equilibrium are

(a)     Mesomers

(b)     Metamers

(c)     Tautomers

(d)     Conformers

(13)    The minimum number of carbon atoms an alkane should possess in order to show optical isomerism—

(a)     Six

(b)     Seven

(c)     Five

(d)     Four

(14)    Meso Tartaric acid is optically inactive due to:

(a)     Molecular asymmetry

(b)     Presence of two Chiral carbon atoms

(c)     External compensation

(d)     Internal Compensation

(15)      Isopentane can form four isomeric bromo derivatives. How many of them are optically active?

(a)     1

(b)     2

(c)     3

(d)     4

(16)      How many stereoisomers would be expected for compounds that could be written as CH₃CH(OH)CH(OH)CH(OH)CH₂OH

(a)     1

(b)     2

(c)     4

(d)     8

(17)      The number of isomers that could have the name bromopropane is

(a)     0

(b)     1

(c)     2

(d)     3

(18)     The most stable conformation for ethane is called

(a)     Anti

(b)     Gauche

(c)     Eclipsed

(d)     Staggered

(19)     Which statement about enantiomers is NOT true?

(a)     They have identical melting points

(b)     They have identical boiling points

(c)     The magnitude of their specific rotations is identical

(d)     They have identical densities

(20)      How many alkenes of molecular formula C₅H₁₀ exist that DO NOT show cis-trans isomerism?

(a)     1                     

(b)     3

(c)     2                     

(d)     more than 3