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CHXI13:HYDROCARBONS

318302 Which of the following reagents will be able to distinguish between 1-Butyne and 2-Butyne?

1

{NaNH}_{2}

2

HCl

3

O_{2}

4

{Br}_{2}

Explanation:

1-Butyne reacts with ${NaNH}_{2}$ to give sodium salt while 2-Butyne does not react. Only terminal alkynes are acidic.
$\begin{matrix} C H_{3} - C H_{2} - C \equiv C - H \overset{+ NaN H_{2}}{\to} \\ 1 - Butyne \end{matrix}$
${NH}_{3} + {CH}_{3} - {CH}_{2} - C \equiv C^{\oplus} {Na}^{\oplus} + {NH}_{3}$

CHXI13:HYDROCARBONS

318303 Presence of unsaturation in organic compounds can be tested with

1 Fehling's reagent

2 Tollen's reagent

3 Baeyer's reagent

4 None of the above

CHXI13:HYDROCARBONS

318304 Given below are two statements
Statement A :
Alkaline ${KMnO}_{4}$ is used to distinguish cyclopentane from propene.
Statement B :
Baeyer's reagent is decolourized by propene but not cyclopentane.

In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI13:HYDROCARBONS

318302 Which of the following reagents will be able to distinguish between 1-Butyne and 2-Butyne?

1

{NaNH}_{2}

2

HCl

3

O_{2}

4

{Br}_{2}

Explanation:

1-Butyne reacts with ${NaNH}_{2}$ to give sodium salt while 2-Butyne does not react. Only terminal alkynes are acidic.
$\begin{matrix} C H_{3} - C H_{2} - C \equiv C - H \overset{+ NaN H_{2}}{\to} \\ 1 - Butyne \end{matrix}$
${NH}_{3} + {CH}_{3} - {CH}_{2} - C \equiv C^{\oplus} {Na}^{\oplus} + {NH}_{3}$

CHXI13:HYDROCARBONS

318303 Presence of unsaturation in organic compounds can be tested with

1 Fehling's reagent

2 Tollen's reagent

3 Baeyer's reagent

4 None of the above

CHXI13:HYDROCARBONS

318304 Given below are two statements
Statement A :
Alkaline ${KMnO}_{4}$ is used to distinguish cyclopentane from propene.
Statement B :
Baeyer's reagent is decolourized by propene but not cyclopentane.

In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

CHXI13:HYDROCARBONS

318302 Which of the following reagents will be able to distinguish between 1-Butyne and 2-Butyne?

1

{NaNH}_{2}

2

HCl

3

O_{2}

4

{Br}_{2}

Explanation:

1-Butyne reacts with ${NaNH}_{2}$ to give sodium salt while 2-Butyne does not react. Only terminal alkynes are acidic.
$\begin{matrix} C H_{3} - C H_{2} - C \equiv C - H \overset{+ NaN H_{2}}{\to} \\ 1 - Butyne \end{matrix}$
${NH}_{3} + {CH}_{3} - {CH}_{2} - C \equiv C^{\oplus} {Na}^{\oplus} + {NH}_{3}$

CHXI13:HYDROCARBONS

318303 Presence of unsaturation in organic compounds can be tested with

1 Fehling's reagent

2 Tollen's reagent

3 Baeyer's reagent

4 None of the above

CHXI13:HYDROCARBONS

318304 Given below are two statements
Statement A :
Alkaline ${KMnO}_{4}$ is used to distinguish cyclopentane from propene.
Statement B :
Baeyer's reagent is decolourized by propene but not cyclopentane.

In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

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