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(A) Optically active 2-iodobutane on tre...

(A) Optically active 2-iodobutane on treatment with NaI in acetone undergoes recemization.
(R) Reaction imvolves multiple Walden inversion and the product contains mixture of dextro and laevo isomer.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A)

B

If both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

If (A) is correct but (R) is incorrect.

D

If (A) is incorrect but (R) is correct.

Text Solution

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The correct Answer is:
A
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Statement-I: Optically active 2-idoibutane on treatment with NaI in acetone undergoes racemisation. Because Statement-II: Repeated Walden inversions on the reactant and its product evantually gives a racemic mixure.

Optically active 2-iodo burtane on treatment with NaI in acetone gives a product which does not show optical activity. Explain briefly.

Assertion: CH_(3)CHClCH_(2)CH_(3)underset("acetone")overset(NaI" in")toA racemic mixture. Reason: The reaction invovles Walden Inversion and the product is a mixture of dextro and laevo isomers.

The optically active product obtained from S_(N)2 reaction of dextro rotatory compound will be ________.

Nuclephilic substitution reaction is given by those compounds which have nucleophilic groups as leaving groups. The weaker the basicity of a group of the substrate, the better is its leaving ability. In nucleophilic substitution reactions, the basicity of leaving group should be less than the incoming nucleophilic group. Nucleophilc substitution reaction at sp^(3) -hybridised carbon is either bimolecular (S_(N^(2))) or unimolecular (S_(N^(1))) . Bimolecular reaction takes place in single step, involving transition state intermediate. In S_(N^(2)) reaction is preferred if the compound has less steric hindrance. Unimolecular (S_(N^(2))) reaction involves two steps and carbonium ion intermediate. Optically active substrates give recemic mixture in these reactions. S_(N^(2)) reaction involves transition state intermediate, hence it is favoured in which of the following solvents?

Iodoform is obtained by the reaction of acetone with hypoiodite but not with iodide I on. Explain. (b) Optically active 2-iodobutane on treatment with Nal in acetone gives a product which does not show optical activity. Why?

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