Haloalkanes and Haloarenes Test 15

Result

Haloalkanes and Haloarenes Test 15

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Question 1
1 / -0

Only One Option Correct Type

Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Provide the structure of the major organic product which results in the following reaction.

A

B

C

D

Solution

β - H anti to leaving halide is taken by base.
Question 2
1 / -0

Provide the structure of the major organic product which results in the following reaction.

A

B

C

D

Solution

β-H, anti to Br at more substituted β-carbon is lost to give more stable alkene.
Question 3
1 / -0

Provide the structure of the major organic product which results in the following reaction.

A

B

C

D

Solution

β-H at the bridging carbon is anti to leaving group,lost in E2 reaction.
Question 4
1 / -0

Provide the structure of the major organic product which results in the following reaction.

A

B

C

D

Solution
Question 5
1 / -0

How many distinct alkene products are possible when the alkyl iodide given below undergoes E2 elimination?

A
1

B
2

C
3

D
4

Solution
Question 6
1 / -0

Provide the structure of the major organic product given in the following reaction.

A
cis-1,2-diphenyl propene

B
trans-1, 2-diphenyl propene

C
equal mixture of (a) and (b)

D
cis-1, 3-diphenyi propene

Solution

In the above reaction, appropriate conformer of the given compound is drawn first which has ‘Br’ and ‘H‘ an anti position (I).
Question 7
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Which of the following alkyl halides can produce only a single alkene product when treated with sodium methoxide?

A
2-chloro-2-methyl pentane

B
3-chloro-3-ethyl pentane

C
3-chloro-2-methyl pentane

D
2-chloro-4-methyl pentane

Solution

In the above reaction, all β-H are equivalent. Hence, a single alkene is formed in E2 reaction
Question 8
1 / -0

Which of the alkyl chlorides listed below undergoes dehydrohaiogenation in the presence of a strong base to give 2-pentene as the only alkene product?

A
1-chloropentane

B
2-chloropentane

C
3-chloropentane

D
1-chloro-2-methyl butane

Solution
Question 9
1 / -0

Which of the following statements is true concerning the E2 reactions of alkyl fluorides?

A
Alkyl fluorides react more readily in E2 reactions that do alkyl iodides

B
The transition state of this E2 reaction resembles a carbanion rather than an alkene

C
The C—F bond is the weakest carbon-halogen bond, so S_N2 will always predominate over E2 in the reactions of alkyl fluorides

D
Alkyl fluoflties react to form the most stable carbocation intermediate

Solution

FI uorine is most electronegative, increases acidity of β-H to the most.
Question 10
1 / -0

What is the increasing order of reactivity of the following in an E2 reaction with ethanolic KOH solution?

A
I < II < III < IV

B
IV < III < II < I

C
III < I < II < IV

D
I < II < IV < III

Solution

(III) is most reactive as it has most acidic β-H as well as it gives resonance stabilised alkene.Next to (III) is (IV) as it is tertiary. (I) is less reactive than (II) because (I) gives less substituted alkene.