Haloalkanes and Haloarenes Test 13

Result

Haloalkanes and Haloarenes Test 13

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Weekly Quiz Competition

Question 1
1 / -0

Only One Option Correct Type
Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. Each question has four choices (a), (b), (c))and (d), out of which ONLY ONE is correct.
Q.
Which of the following would be the strongest nucleophile in methanol?

A

B

C

D

Solution

Nucleophilicity increases down the group in hydroxylic solvents.
Question 2
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Predict the product in nucleophilic substitution reaction.

A

B

C

D

Solution

Inversion of configuration takes place at chiral carbon.
Question 3
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What is the product of the given reaction?

A

B

C

D

Solution

attack at less substituted carbon of epoxide ring from the side opposite to — CH₃ group.
Question 4
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Which is the product of the given reaction?

A

B

C

D

Solution
Question 5
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What is the major product of the given reaction ?

A

B

C

D

Solution

α-carbon is achiral, hence retention of configuration at β-carbon.
Question 6
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Which of the following are the examples of strong nucleophiles but weak base in protic solvents?
I. CH₃S^-
II. CH3O^-
III. I^-
IV. H₂O
V. F^-

A
Both land IV

B
Both IV and V

C
Both I and III

D
Both III and IV

Solution

Both CH₃S^- and I^- are weak bases but strong nucleophiles.
Question 7
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The specific rotation of optically pure (R)-2- butanol is -13.52° at 25°C. An optically pure sample of (R)-2- bromobutane was treated with aqueous NaOH in order to form 2-butanol via S_N2 reaction. What would be the specific rotation of the product assuming 100% yield?

A
0°

B
-13.52°

C
+13.52°

D
None of these

Solution

(S)-2-butanol is formed with specific rotation + 13.52°.
Question 8
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Which of the following correctly describe the relative nucleophilicities of methoxide and tertiary butoxide ion?

A
These alkoxides have essentially the same nucleophilicities since, the negative charge in both is localised on an oxygen atom

B
Tertiary butoxide is more nucleophilic because it is more basic

C
Methoxide is more nucleophilic because the nucleophilicity of tertiary butoxide is diminished by steric effect.

D
Tertiary butoxide is more nucleophilic because it contains three methyl groups which increases the charge on oxygen by donating electron density

Solution

Although CH₃O^- is weaker base than (CH₃)₃CO^- , former is stronger nucleophile due to smaller size.
Question 9
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Arrange the following in increasing order of reactivity in an S_N2 reaction with K I in acetone solvent.

A
I < IV < III < II

B
IV < I < III < II

C
ll < III < I < IV

D
III < II < I < IV

Solution

In halogen-exchange (Finkelstein reaction), reactivity is determined by solubility of Na X formed in acetone. Lower the solubility of Na X in acetone, easier the reaction. NaCI is less soluble than NaBr in acetone.
Question 10
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In the following set of nucleophiles, the strongest and the weakest nucleophile respectively are
I. CH₃S^-
II. CH₃COC^-
III. HO^-
IV. C₆H₅C^-

A
Both I and II

B
Both I and IV

C
Both III and II

D
Both IV and II

Solution

CH3S^-(I) is strongest nucleophile and C6H5O^-(IV) is weakest due to resonance stabilisation in it.
Question 11
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The major product of the following reaction is:

A

B

C

D

Solution
Question 12
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Which of the following on treatment with NaCN (aq) results in an achiral product?

A

B

C

D

Solution