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Only One Option Correct Type
Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q. 
Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can have
  • a)
    three stereoisomers, all chiral and optically active
  • b)
    two chiral stereoisomers (enantiomers ) and one achiral
  • c)
    three stereoisomers, all achiral
  • d)
    two stereoisomers, both achiral
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Only One Option Correct TypeDirection (Q. Nos. 1-10) This section cont...

Optical isomers have mirror images that cannot be superimposed on one another. These are called as enantiomers. The molecules or ions that cannot be superimposed are called chiral.
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Most Upvoted Answer
Only One Option Correct TypeDirection (Q. Nos. 1-10) This section cont...
Explanation:

The given compound is [Co(en)3]3+, which contains three ethylenediamine (en) ligands coordinated to a cobalt (III) cation.

Stereoisomerism:
Stereoisomerism is a form of isomerism in which the connectivity of atoms is the same, but the arrangement of atoms in space is different. In other words, stereoisomers have the same molecular formula and connectivity but differ in the spatial arrangement of their atoms.

Chirality:
Chirality is a property of a molecule that is not superimposable on its mirror image. Chiral molecules exist as pairs of enantiomers, which are non-superimposable mirror images of each other.

Achirality:
Achiral molecules are those that do not have chirality or do not possess a non-superimposable mirror image.

Now, let's analyze the given compound [Co(en)3]3+ for its stereoisomerism and chirality.

Analysis:

The coordination geometry of the cobalt (III) cation in [Co(en)3]3+ is octahedral, with three ethylenediamine (en) ligands arranged in a trigonal prismatic fashion around the central cobalt atom.

Trigonal Prismatic Geometry:
In a trigonal prismatic geometry, the three ligands are arranged in a trigonal plane, while the other three ligands are arranged above and below this plane.

Possible Stereoisomers:
In [Co(en)3]3+, the three ethylenediamine (en) ligands can be arranged in different ways around the central cobalt atom, resulting in different stereoisomers.

Chiral Stereoisomers:
If the arrangement of ligands leads to a chiral molecule, then it will have two enantiomers (mirror image isomers). In this case, two chiral stereoisomers can be formed.

Achiral Stereoisomer:
If the arrangement of ligands leads to an achiral molecule, then it will not have a non-superimposable mirror image. In this case, one achiral stereoisomer can be formed.

Conclusion:
Therefore, the compound [Co(en)3]3+ can have two chiral stereoisomers (enantiomers) and one achiral stereoisomer. Thus, the correct answer is option B.
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Read the passage given below and answer the following questions:The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.Q. In thisquestions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.Assertion (

A chemist isolated a compound A with molecular formula C7H13Br. A undergoes very fast SN1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp3-hybridised carbon atoms. Among those five sp3 carbon atoms, three are methyl groups, one CH2 group and one CH group.It also contains two sp2-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp2 carbons.The compound contains a total of six aliylic hydrogen atoms.The carbon atom that holds the Br has one H attached to it.Working SpaceWhen compound A reacts with boiling water, it undergoes a SN1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C7H14O. Among the two alcohols, B has the OH group attached to a sp3 carbon atom that has no H -atoms bonded to it.Q.What can be said about the isomerism shown by the two alcohols B and C ?

Only One Option Correct TypeDirection (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.Q.Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can havea)three stereoisomers, all chiral and optically activeb)two chiral stereoisomers (enantiomers ) and one achiralc)three stereoisomers, all achirald)two stereoisomers, both achiralCorrect answer is option 'B'. Can you explain this answer?
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Only One Option Correct TypeDirection (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.Q.Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can havea)three stereoisomers, all chiral and optically activeb)two chiral stereoisomers (enantiomers ) and one achiralc)three stereoisomers, all achirald)two stereoisomers, both achiralCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Only One Option Correct TypeDirection (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.Q.Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can havea)three stereoisomers, all chiral and optically activeb)two chiral stereoisomers (enantiomers ) and one achiralc)three stereoisomers, all achirald)two stereoisomers, both achiralCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Only One Option Correct TypeDirection (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.Q.Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can havea)three stereoisomers, all chiral and optically activeb)two chiral stereoisomers (enantiomers ) and one achiralc)three stereoisomers, all achirald)two stereoisomers, both achiralCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Only One Option Correct TypeDirection (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.Q.Tris (ethylenediamine) cobalt (III) cation, [Co(en)3]3+ can havea)three stereoisomers, all chiral and optically activeb)two chiral stereoisomers (enantiomers ) and one achiralc)three stereoisomers, all achirald)two stereoisomers, both achiralCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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