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Byju's Answer
Standard XII
Chemistry
Addition of Sulphuric Acid and Water
For the above...
Question

For the above series of reaction, what can be predicted about stereochemistry of final product?

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A
meso compound
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B
a chiral compound
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C
racemic mixture
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D
a pair of diastereomers
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Solution

The correct option is C racemic mixture
For the given series of reaction, final product is a racemic mixture. The C≡C triple bond of 2-butene is selectively reduced to cis C=C double bond by hydrogen gas in presence of Lindlar's catalyst to obtain cis-3-butene. Anti addition of bromine to cis-2-butene gives racemic mixture of dibromides.

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Q.

The correct statement(s) about the following compound
H3C(OH)HC−CH=CH−CH(OH)CH3(X) is/are:


Q. Match the compounds/reactions in List I with their stereochemistry in List II. Matching can be one or more than one.
Q. Match the compounds in Column I with their characteristics/tests/reactions (s) reagent(s)/stereochemistry/isomer(s) given in Column II. Matching can be one or more than one.
Column IColumn II
ReactionProduct and name of the reaction
Q.
A schematic analysis of the reaction of one enantiomer with racemic mixture is shown below
d+dandl→(d)−(d)The(+)formofAracemicmixtureof+chiralmoleculesothermoleculeswith(d)−(l)50%(d)and50%(l)

The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the mirror image of (d-d) is (l-l) not (d-l). They are diastereomers, 'stereoisomers that are not mirror images'.

The formation of diastereomers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general procedure for separating enantiomers is to allow them to react with naturally occurring chiral molecule to form a pair of diastereomers. These can be separated easily as they have different physical properties. if the original chemical reaction can be reversed, the enantiomers can be isolated.

Which of the following is an example of diastereomers?
Q. Trans−3,6−dimethyloct−4−ene (A) exists in two diastereomers (I) and (II). Which statement is true about (I) and (II)? If the stereochemistry about the double bond in (A) is cis-, the total number of stereoisomers for (A) is:
248207_7a4ec1bf5d934bceb276f08ee2cabc20.png
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Standard XII Chemistry
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