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Test: Physical Properties & General Reaction (February 11) - NEET MCQ


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10 Questions MCQ Test Daily Test for NEET Preparation - Test: Physical Properties & General Reaction (February 11)

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Test: Physical Properties & General Reaction (February 11) - Question 1

Match the reactants from Column I with the reagents and expected outcomes from Column II. Mark the correct option form the codes given below.

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 1

(i) It has a carbonyl carbon that turns chiral on reduction with hydrides. Hence, with LiAIH4 or aluminium isopropoxide, gives racemic mixture. Also, it has no other functional groups, either Clemmensen reduction or Wolff-Kishner reduction can be used.
(ii) It has an olefinic double bond, Clemmensen reduction would not be suitable for selective reduction of carbonyl group.
(iii) LiAlH4 also reduces primary halide but aluminium isopropoxide does not. Wolff-Kishner reduction would not be suitable because HO- reacts with halide group (EN2 or E2).
(iv) Same reasons as with (i).

Test: Physical Properties & General Reaction (February 11) - Question 2

Which of the following will give a racemic mixture on reduction with NaBH4 followed by acid work-up?

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 2

NaBH4 brings about reduction of carbonyls by hydrid e transfer mechanism at planar sp2 carbon. Hence, if a chiral carbon is generated, racemic mixture is always produced.

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*Multiple options can be correct
Test: Physical Properties & General Reaction (February 11) - Question 3

One or More than One Options Correct Type

Consider the following reaction,

Q. 

The organic product(s) formed above is/are

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 3

In MPV reduction, carbonyl is reduced to alcohol while isopropoxide fraction of reducing agent is oxidised to acetone.

Test: Physical Properties & General Reaction (February 11) - Question 4

The reagent which can best bring about the following transformation is

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 4

With aluminium isopropoxide (MPV reduction), carbonyls are selectively reduced to alcohols leaving other groups intact.

*Answer can only contain numeric values
Test: Physical Properties & General Reaction (February 11) - Question 5

If glyoxal glycol is treated with a mixture of CH3MgBr and C2H5MgBr in diethyl ether followed by acid hydrolysis, how many different diols would be formed, which are simultaneously optically active?


Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 5


One pair of enantiomers for each (I) and (II) while two pairs of enantiomers for (III). 

Test: Physical Properties & General Reaction (February 11) - Question 6

Which is the most suitable reagent for the following transformation?

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 6

Clemmensen reduction is suitable for reductio n of carbonyls containing additional acidic functional group.

*Answer can only contain numeric values
Test: Physical Properties & General Reaction (February 11) - Question 7

One integer Value Correct Type

If all the aldehyde isomers of C5H10O is independently treated with HCN/NaCN solution, how many of them will give racemic mixture of cyanohydrin?


Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 7


IV is enantiomeric. Its pure enantiomer, with HCN/NaCN, would produce pair of diastereomers.

*Answer can only contain numeric values
Test: Physical Properties & General Reaction (February 11) - Question 8

If one molecule of trioxane is heated, how many molecules of formaldehyde would be formed?


Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 8

*Multiple options can be correct
Test: Physical Properties & General Reaction (February 11) - Question 9

Consider the following reaction,

Q. 

The correct deduction(s) regarding mechanism of the above reaction is/are

Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 9

H- (hydride) ion undergoes nu cle ophilic ad dition at sp2 carbon of carbonyls. Aldehydes are more reactive than ketones due to less steric hindrance in former case. Since, nucleophilic attack of hydride ion occur at planar carbonyl carbon, there is equal probability of attack from both side of plane giving racemic mixture if chiral carbon is generated.

*Answer can only contain numeric values
Test: Physical Properties & General Reaction (February 11) - Question 10

Consider the reaction given below,

Q. 

X is formed in which a new ring is formed. How many atoms are present in this new ring?


Detailed Solution for Test: Physical Properties & General Reaction (February 11) - Question 10

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