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Topic Question Set

Q 11 :

‘A’ and ‘B’ formed in the following set of reactions are:              [2023]

[IMAGE 208]

  • [IMAGE 209]

     

  • [IMAGE 210]

     

  • [IMAGE 211]

     

  • [IMAGE 212]

     

(4)

[IMAGE 213]

Q 12 :

Compound A, C5H10O5, given a tetraacetate with Ac2O and oxidation of A with Br2-H2O gives an acid, C5H10O6. Reduction of A with HI gives isopentane. The possible structure of A is:                    [2023]

  • [IMAGE 214]

     

  • [IMAGE 215]

     

  • [IMAGE 216]

     

  • [IMAGE 217]

     

(3)

[IMAGE 218]

Q 13 :

Decreasing order of dehydration of the following alcohols is        [2023]

[IMAGE 219]

  • a > d > b > c

     

  • d > b > c > a

     

  • b > a > d > c

     

  • b > d > c > a

     

(4)

Ease of dehydration ∝ stability of carbocation.

 

Q 14 :

A solution of CrO5 in amyl alcohol has a ______ colour.            [2023]

  • Yellow

     

  • Orange-Red

     

  • Green

     

  • Blue

     

(4)

CrO5 is more soluble in organic solvent like amyl alcohol and blue coloured organic layer is obtained.

 

Q 15 :

In the following reaction, ‘B’ is                        [2023]

[IMAGE 220]

  • [IMAGE 221]

     

  • [IMAGE 222]

     

  • [IMAGE 223]

     

  • [IMAGE 224]

     

(4)

[IMAGE 225]

Q 16 :

The strongest acid from the following is                  [2023]

  • [IMAGE 226]

     

  • [IMAGE 227]

     

  • [IMAGE 228]

     

  • [IMAGE 229]

     

(1)

Due to presence of —NO2 group at meta position, phenoxide ion formed is the most stabilised conjugate ion, therefore, its corresponding compound is the strongest acid. Hence the compound [IMAGE 230] is the strongest acid among the given.

Q 17 :

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Butan-1-ol has higher boiling point than ethoxyethane.

Reason R: Extensive hydrogen bonding leads to stronger association of molecules.

In the light of the above statements, choose the correct answer from the options given below:        [2023]

  • Both A and R are true but R is not the correct explanation of A

     

  • A is false but R is true

     

  • Both A and R are true and R is the correct explanation of A

     

  • A is true but R is false

     

(3)

Due to intermolecular hydrogen bonding in Butane-1-ol, association of molecule increases resulting increase in attraction between the molecules and hence boiling point increases.

Q 18 :

Incorrect method of preparation for alcohols from the following is:                [2023]

  • Reaction of ketone with RMgBr followed by hydrolysis

     

  • Reaction of alkyl halide with aqueous NaOH.

     

  • Ozonolysis of alkene.

     

  • Hydroboration–oxidation of alkene.

     

(3)

In ozonolysis of alkene aldehydes or ketones are formed as product.

[IMAGE 231]

 

Q 19 :

[IMAGE 232]

Product [X] formed in the above reaction is:             [2023]

  • [IMAGE 233]

     

  • [IMAGE 234]

     

  • H3C—CH2—CH=CH2

     

  • H3C—CH=CH—CH3

     

(2)

[IMAGE 235]

Q 20 :

In the reaction given below:

[IMAGE 236]

'B' is:                                                 [2023]

  • [IMAGE 237]

     

  • [IMAGE 238]

     

  • [IMAGE 239]

     

  • [IMAGE 240]

     

(3)

[IMAGE 241]