QBManager

CHXI13:HYDROCARBONS

318144 Compound A formed in the following reaction reacts with B and gives the product C . Find A and $B$ .
supporting img

1

A = {CH}_{3} - {CH}_{2} - {CH}_{3}

,

B = {CH}_{3} - C \equiv CH

2

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

3

A = {CH}_{3} - CH = {CH}_{2}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

4

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{3}

Explanation:

Reaction takes place as under:
${CH}_{3} - C \equiv CH + Na \to {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na} + H_{2} ↑$
$C H_{3} - C \equiv \overset{―}{C} \overset{+}{N a} + \underset{(B)}{C H_{3} C H C H_{2}} - B r \to$
$C H_{3} - C \equiv C_{(C)} - C H_{2} C H_{2} C H_{3} + N a B r$
So, the correct option is (2).

JEE Main - 2024

CHXI13:HYDROCARBONS

318145 Assertion :
Acetylene reacts with sodamide to evolve ${NH}_{3}$ gas.
Reason :
Acetylene is a weaker acid than ammonia.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HC \equiv CH + {NaNH}_{2}^{-} \to HC \equiv \overset{―}{C} N a^{+} + N H_{3}$
Acetylene is a stronger acid than ammonia. So, option (3) is correct

CHXI13:HYDROCARBONS

318146 Which of the following compounds reacts with an aqueous solution of $[Ag {({NH}_{3})}_{2}] OH$ ?

1 Ethane

2 Ethene

3 1-butyne

4 2-butyne

Explanation:

Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides.
Reaction with ammonical ${AgNO}_{3}$ solution $[Ag {({NH}_{3})}_{2}] OH$ is as follows:
supporting img

CHXI13:HYDROCARBONS

318147 Acetylenic hydrocarbons are acidic because

1 Sigma electron density of

C  -  H

bond in acetylene is nearer a carbon which has

50 %

s-character

2 Acetylene has only one hydrogen atom at each carbon atom

3 Acetylene contains least number of hydrogen atoms among the possible

4 Acetylene belongs to the class of alkynes with formula

C_{n} H_{2 n - 2}

Explanation:

The acidic character of $H$ is, $F - H > O - H > \equiv C - H > N - H ; H$ atom attached on F, O, N and triply bonded carbon is acidic.

CHXI13:HYDROCARBONS

318144 Compound A formed in the following reaction reacts with B and gives the product C . Find A and $B$ .
supporting img

1

A = {CH}_{3} - {CH}_{2} - {CH}_{3}

,

B = {CH}_{3} - C \equiv CH

2

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

3

A = {CH}_{3} - CH = {CH}_{2}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

4

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{3}

Explanation:

Reaction takes place as under:
${CH}_{3} - C \equiv CH + Na \to {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na} + H_{2} ↑$
$C H_{3} - C \equiv \overset{―}{C} \overset{+}{N a} + \underset{(B)}{C H_{3} C H C H_{2}} - B r \to$
$C H_{3} - C \equiv C_{(C)} - C H_{2} C H_{2} C H_{3} + N a B r$
So, the correct option is (2).

JEE Main - 2024

CHXI13:HYDROCARBONS

318145 Assertion :
Acetylene reacts with sodamide to evolve ${NH}_{3}$ gas.
Reason :
Acetylene is a weaker acid than ammonia.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HC \equiv CH + {NaNH}_{2}^{-} \to HC \equiv \overset{―}{C} N a^{+} + N H_{3}$
Acetylene is a stronger acid than ammonia. So, option (3) is correct

CHXI13:HYDROCARBONS

318146 Which of the following compounds reacts with an aqueous solution of $[Ag {({NH}_{3})}_{2}] OH$ ?

1 Ethane

2 Ethene

3 1-butyne

4 2-butyne

Explanation:

Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides.
Reaction with ammonical ${AgNO}_{3}$ solution $[Ag {({NH}_{3})}_{2}] OH$ is as follows:
supporting img

CHXI13:HYDROCARBONS

318147 Acetylenic hydrocarbons are acidic because

1 Sigma electron density of

C  -  H

bond in acetylene is nearer a carbon which has

50 %

s-character

2 Acetylene has only one hydrogen atom at each carbon atom

3 Acetylene contains least number of hydrogen atoms among the possible

4 Acetylene belongs to the class of alkynes with formula

C_{n} H_{2 n - 2}

Explanation:

The acidic character of $H$ is, $F - H > O - H > \equiv C - H > N - H ; H$ atom attached on F, O, N and triply bonded carbon is acidic.

CHXI13:HYDROCARBONS

318144 Compound A formed in the following reaction reacts with B and gives the product C . Find A and $B$ .
supporting img

1

A = {CH}_{3} - {CH}_{2} - {CH}_{3}

,

B = {CH}_{3} - C \equiv CH

2

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

3

A = {CH}_{3} - CH = {CH}_{2}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

4

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{3}

Explanation:

Reaction takes place as under:
${CH}_{3} - C \equiv CH + Na \to {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na} + H_{2} ↑$
$C H_{3} - C \equiv \overset{―}{C} \overset{+}{N a} + \underset{(B)}{C H_{3} C H C H_{2}} - B r \to$
$C H_{3} - C \equiv C_{(C)} - C H_{2} C H_{2} C H_{3} + N a B r$
So, the correct option is (2).

JEE Main - 2024

CHXI13:HYDROCARBONS

318145 Assertion :
Acetylene reacts with sodamide to evolve ${NH}_{3}$ gas.
Reason :
Acetylene is a weaker acid than ammonia.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HC \equiv CH + {NaNH}_{2}^{-} \to HC \equiv \overset{―}{C} N a^{+} + N H_{3}$
Acetylene is a stronger acid than ammonia. So, option (3) is correct

CHXI13:HYDROCARBONS

318146 Which of the following compounds reacts with an aqueous solution of $[Ag {({NH}_{3})}_{2}] OH$ ?

1 Ethane

2 Ethene

3 1-butyne

4 2-butyne

Explanation:

Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides.
Reaction with ammonical ${AgNO}_{3}$ solution $[Ag {({NH}_{3})}_{2}] OH$ is as follows:
supporting img

CHXI13:HYDROCARBONS

318147 Acetylenic hydrocarbons are acidic because

1 Sigma electron density of

C  -  H

bond in acetylene is nearer a carbon which has

50 %

s-character

2 Acetylene has only one hydrogen atom at each carbon atom

3 Acetylene contains least number of hydrogen atoms among the possible

4 Acetylene belongs to the class of alkynes with formula

C_{n} H_{2 n - 2}

Explanation:

The acidic character of $H$ is, $F - H > O - H > \equiv C - H > N - H ; H$ atom attached on F, O, N and triply bonded carbon is acidic.

CHXI13:HYDROCARBONS

318144 Compound A formed in the following reaction reacts with B and gives the product C . Find A and $B$ .
supporting img

1

A = {CH}_{3} - {CH}_{2} - {CH}_{3}

,

B = {CH}_{3} - C \equiv CH

2

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

3

A = {CH}_{3} - CH = {CH}_{2}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{2} - Br

4

A = {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na}

,

B = {CH}_{3} - {CH}_{2} - {CH}_{3}

Explanation:

Reaction takes place as under:
${CH}_{3} - C \equiv CH + Na \to {CH}_{3} - C \equiv \overset{―}{C} \overset{+}{Na} + H_{2} ↑$
$C H_{3} - C \equiv \overset{―}{C} \overset{+}{N a} + \underset{(B)}{C H_{3} C H C H_{2}} - B r \to$
$C H_{3} - C \equiv C_{(C)} - C H_{2} C H_{2} C H_{3} + N a B r$
So, the correct option is (2).

JEE Main - 2024

CHXI13:HYDROCARBONS

318145 Assertion :
Acetylene reacts with sodamide to evolve ${NH}_{3}$ gas.
Reason :
Acetylene is a weaker acid than ammonia.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HC \equiv CH + {NaNH}_{2}^{-} \to HC \equiv \overset{―}{C} N a^{+} + N H_{3}$
Acetylene is a stronger acid than ammonia. So, option (3) is correct

CHXI13:HYDROCARBONS

318146 Which of the following compounds reacts with an aqueous solution of $[Ag {({NH}_{3})}_{2}] OH$ ?

1 Ethane

2 Ethene

3 1-butyne

4 2-butyne

Explanation:

Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides.
Reaction with ammonical ${AgNO}_{3}$ solution $[Ag {({NH}_{3})}_{2}] OH$ is as follows:
supporting img

CHXI13:HYDROCARBONS

318147 Acetylenic hydrocarbons are acidic because

1 Sigma electron density of

C  -  H

bond in acetylene is nearer a carbon which has

50 %

s-character

2 Acetylene has only one hydrogen atom at each carbon atom

3 Acetylene contains least number of hydrogen atoms among the possible

4 Acetylene belongs to the class of alkynes with formula

C_{n} H_{2 n - 2}

Explanation:

The acidic character of $H$ is, $F - H > O - H > \equiv C - H > N - H ; H$ atom attached on F, O, N and triply bonded carbon is acidic.

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