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Hydrocarbons

230090 Match the following?

	Reaction		Nature of Reaction
a.	$RBr \overset{Na}{\to}$	i.	Partial reduction
b.	${RCOO}^{-} {Na}^{+} \to_{Ca (O, Δ}^{NaO}$	ii.	Electrophilic addition
c.		iii.	Wurtz reaction
d.	$H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{\to}$	iv.	Decarboxylation
		v.	Decarboxylative dimerization

1

(a - i i i), (b - v), (c - i), (d - i i)

2

(a - i i i), (b - i v), (c - i), (d - i i)

3

(a - i i), (b - i i i), (c - i), (d - i i)

4

(a - v), (b - i), (c - i i i), (d - i i)

Explanation:

: (a) $RBr \overset{Na}{⟶} R - R + 2 {Na}^{+} X^{-}$
Wurtz reaction is a coupling reaction of two alkyl halides are reacted with sodium metal to form higher all cane.
(b) ${RCOO}^{-} {Na}^{+} \to_{CaO, D}^{NaOH} R - H + {Na}_{2} {CO}_{3}$
This reaction is known as decorboxylative dimerization
(c) $R - C \equiv C - R$ ,
original image
(d) $H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{⟶} Br \cdot N_{2} C - {CH}_{2} Br$
This reaction is electrophilic addition reaction. So, the option (b) is correct.

AP EAPCET 24.08.2021 Shift-II

Hydrocarbons

230091 Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane.
Reason (B) Methyl free radical is formed at cathode

1 Both

A

and

R

are true and

R

is a correct explanation for

A

2 Both

A

and

R

are true but

R

is not a correct explanation for

A

3

A

is true,

R

is false

4

A

is false,

R

is true

Explanation:

: An aqueous solution of sodium acetate on electrolysis gives alkane i.e. ethane.
$\begin{aligned} \underset{sotumactate}{2 {CH}_{3} OONa} + 2 H_{2} O \overset{Electruysis}{⟶} {CH}_{3} - {CH}_{3} + & 2 {CO}_{2} + H_{2} \\ + 2 NaOH \end{aligned}$
Hence, first statement is true.
At cathode reaction takes place which is given as -
$\begin{array}{r} H_{2} O + e^{8} ⟶ {OH}^{*} + H^{∙} \\ Hydro gen free radical \end{array}$
In this reaction, hydrogen free radical are formed.

AP EAPCET 19-08-2021 Shift-I

Hydrocarbons

230092 The chlorination of ethane is an example which type of the following reactions?

1 Nucleophilic substitution

2 Electrophilic substitution

3 Free radical substitution

4 Rearrangement

Explanation:

: Chlorination of ethane take place by free radical substitution in the presence of light, in three steps to form ethyl chloride.
Step-I- Initiation step ${Cl}_{2} \overset{hv}{⟶} 2 \dot{C} 1$
Step-II- Propagation step
original image
Step-III-Termination Step

AP EAMCET (Engg.) 2012

Hydrocarbons

230110 Which of the following aqueous solutions should have the minimum boiling point?

1

0.1 M

Urea

2

0.1 M K_{2} {SO}_{4}

3

0.1 M NaCl

4

0.1 M {FeCl}_{3}

Explanation:

: The boiling point of compounds depends upon the van't Hoff factor. The van't Hoff factor is equal to the number of discrete ions in a formula unit of the substance.
$\begin{array}{ll} {NH}_{2} {CONH}_{2} \to {NH}_{2} {CONH}^{-} + H^{+} & i = 1 \\ K_{2} {SO}_{4} \to 2 K^{+} + {SO}_{4}^{2 -} & i = 3 \\ NaCl \to {Na}^{+} + {Cl}^{-} & i = 2 \\ {FeCl}_{3} \to {Fe}^{3 +} + 3 {Cl}^{-} & i = 4 \end{array}$
Hence, aqueous solution of urea is a covalent compound it show minimum boiling point.

GUJCET-2021

Hydrocarbons

230090 Match the following?

	Reaction		Nature of Reaction
a.	$RBr \overset{Na}{\to}$	i.	Partial reduction
b.	${RCOO}^{-} {Na}^{+} \to_{Ca (O, Δ}^{NaO}$	ii.	Electrophilic addition
c.		iii.	Wurtz reaction
d.	$H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{\to}$	iv.	Decarboxylation
		v.	Decarboxylative dimerization

1

(a - i i i), (b - v), (c - i), (d - i i)

2

(a - i i i), (b - i v), (c - i), (d - i i)

3

(a - i i), (b - i i i), (c - i), (d - i i)

4

(a - v), (b - i), (c - i i i), (d - i i)

Explanation:

: (a) $RBr \overset{Na}{⟶} R - R + 2 {Na}^{+} X^{-}$
Wurtz reaction is a coupling reaction of two alkyl halides are reacted with sodium metal to form higher all cane.
(b) ${RCOO}^{-} {Na}^{+} \to_{CaO, D}^{NaOH} R - H + {Na}_{2} {CO}_{3}$
This reaction is known as decorboxylative dimerization
(c) $R - C \equiv C - R$ ,
original image
(d) $H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{⟶} Br \cdot N_{2} C - {CH}_{2} Br$
This reaction is electrophilic addition reaction. So, the option (b) is correct.

AP EAPCET 24.08.2021 Shift-II

Hydrocarbons

230091 Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane.
Reason (B) Methyl free radical is formed at cathode

1 Both

A

and

R

are true and

R

is a correct explanation for

A

2 Both

A

and

R

are true but

R

is not a correct explanation for

A

3

A

is true,

R

is false

4

A

is false,

R

is true

Explanation:

: An aqueous solution of sodium acetate on electrolysis gives alkane i.e. ethane.
$\begin{aligned} \underset{sotumactate}{2 {CH}_{3} OONa} + 2 H_{2} O \overset{Electruysis}{⟶} {CH}_{3} - {CH}_{3} + & 2 {CO}_{2} + H_{2} \\ + 2 NaOH \end{aligned}$
Hence, first statement is true.
At cathode reaction takes place which is given as -
$\begin{array}{r} H_{2} O + e^{8} ⟶ {OH}^{*} + H^{∙} \\ Hydro gen free radical \end{array}$
In this reaction, hydrogen free radical are formed.

AP EAPCET 19-08-2021 Shift-I

Hydrocarbons

230092 The chlorination of ethane is an example which type of the following reactions?

1 Nucleophilic substitution

2 Electrophilic substitution

3 Free radical substitution

4 Rearrangement

Explanation:

: Chlorination of ethane take place by free radical substitution in the presence of light, in three steps to form ethyl chloride.
Step-I- Initiation step ${Cl}_{2} \overset{hv}{⟶} 2 \dot{C} 1$
Step-II- Propagation step
original image
Step-III-Termination Step

AP EAMCET (Engg.) 2012

Hydrocarbons

230110 Which of the following aqueous solutions should have the minimum boiling point?

1

0.1 M

Urea

2

0.1 M K_{2} {SO}_{4}

3

0.1 M NaCl

4

0.1 M {FeCl}_{3}

Explanation:

: The boiling point of compounds depends upon the van't Hoff factor. The van't Hoff factor is equal to the number of discrete ions in a formula unit of the substance.
$\begin{array}{ll} {NH}_{2} {CONH}_{2} \to {NH}_{2} {CONH}^{-} + H^{+} & i = 1 \\ K_{2} {SO}_{4} \to 2 K^{+} + {SO}_{4}^{2 -} & i = 3 \\ NaCl \to {Na}^{+} + {Cl}^{-} & i = 2 \\ {FeCl}_{3} \to {Fe}^{3 +} + 3 {Cl}^{-} & i = 4 \end{array}$
Hence, aqueous solution of urea is a covalent compound it show minimum boiling point.

GUJCET-2021

Hydrocarbons

230090 Match the following?

	Reaction		Nature of Reaction
a.	$RBr \overset{Na}{\to}$	i.	Partial reduction
b.	${RCOO}^{-} {Na}^{+} \to_{Ca (O, Δ}^{NaO}$	ii.	Electrophilic addition
c.		iii.	Wurtz reaction
d.	$H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{\to}$	iv.	Decarboxylation
		v.	Decarboxylative dimerization

1

(a - i i i), (b - v), (c - i), (d - i i)

2

(a - i i i), (b - i v), (c - i), (d - i i)

3

(a - i i), (b - i i i), (c - i), (d - i i)

4

(a - v), (b - i), (c - i i i), (d - i i)

Explanation:

: (a) $RBr \overset{Na}{⟶} R - R + 2 {Na}^{+} X^{-}$
Wurtz reaction is a coupling reaction of two alkyl halides are reacted with sodium metal to form higher all cane.
(b) ${RCOO}^{-} {Na}^{+} \to_{CaO, D}^{NaOH} R - H + {Na}_{2} {CO}_{3}$
This reaction is known as decorboxylative dimerization
(c) $R - C \equiv C - R$ ,
original image
(d) $H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{⟶} Br \cdot N_{2} C - {CH}_{2} Br$
This reaction is electrophilic addition reaction. So, the option (b) is correct.

AP EAPCET 24.08.2021 Shift-II

Hydrocarbons

230091 Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane.
Reason (B) Methyl free radical is formed at cathode

1 Both

A

and

R

are true and

R

is a correct explanation for

A

2 Both

A

and

R

are true but

R

is not a correct explanation for

A

3

A

is true,

R

is false

4

A

is false,

R

is true

Explanation:

: An aqueous solution of sodium acetate on electrolysis gives alkane i.e. ethane.
$\begin{aligned} \underset{sotumactate}{2 {CH}_{3} OONa} + 2 H_{2} O \overset{Electruysis}{⟶} {CH}_{3} - {CH}_{3} + & 2 {CO}_{2} + H_{2} \\ + 2 NaOH \end{aligned}$
Hence, first statement is true.
At cathode reaction takes place which is given as -
$\begin{array}{r} H_{2} O + e^{8} ⟶ {OH}^{*} + H^{∙} \\ Hydro gen free radical \end{array}$
In this reaction, hydrogen free radical are formed.

AP EAPCET 19-08-2021 Shift-I

Hydrocarbons

230092 The chlorination of ethane is an example which type of the following reactions?

1 Nucleophilic substitution

2 Electrophilic substitution

3 Free radical substitution

4 Rearrangement

Explanation:

: Chlorination of ethane take place by free radical substitution in the presence of light, in three steps to form ethyl chloride.
Step-I- Initiation step ${Cl}_{2} \overset{hv}{⟶} 2 \dot{C} 1$
Step-II- Propagation step
original image
Step-III-Termination Step

AP EAMCET (Engg.) 2012

Hydrocarbons

230110 Which of the following aqueous solutions should have the minimum boiling point?

1

0.1 M

Urea

2

0.1 M K_{2} {SO}_{4}

3

0.1 M NaCl

4

0.1 M {FeCl}_{3}

Explanation:

: The boiling point of compounds depends upon the van't Hoff factor. The van't Hoff factor is equal to the number of discrete ions in a formula unit of the substance.
$\begin{array}{ll} {NH}_{2} {CONH}_{2} \to {NH}_{2} {CONH}^{-} + H^{+} & i = 1 \\ K_{2} {SO}_{4} \to 2 K^{+} + {SO}_{4}^{2 -} & i = 3 \\ NaCl \to {Na}^{+} + {Cl}^{-} & i = 2 \\ {FeCl}_{3} \to {Fe}^{3 +} + 3 {Cl}^{-} & i = 4 \end{array}$
Hence, aqueous solution of urea is a covalent compound it show minimum boiling point.

GUJCET-2021

Hydrocarbons

230090 Match the following?

	Reaction		Nature of Reaction
a.	$RBr \overset{Na}{\to}$	i.	Partial reduction
b.	${RCOO}^{-} {Na}^{+} \to_{Ca (O, Δ}^{NaO}$	ii.	Electrophilic addition
c.		iii.	Wurtz reaction
d.	$H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{\to}$	iv.	Decarboxylation
		v.	Decarboxylative dimerization

1

(a - i i i), (b - v), (c - i), (d - i i)

2

(a - i i i), (b - i v), (c - i), (d - i i)

3

(a - i i), (b - i i i), (c - i), (d - i i)

4

(a - v), (b - i), (c - i i i), (d - i i)

Explanation:

: (a) $RBr \overset{Na}{⟶} R - R + 2 {Na}^{+} X^{-}$
Wurtz reaction is a coupling reaction of two alkyl halides are reacted with sodium metal to form higher all cane.
(b) ${RCOO}^{-} {Na}^{+} \to_{CaO, D}^{NaOH} R - H + {Na}_{2} {CO}_{3}$
This reaction is known as decorboxylative dimerization
(c) $R - C \equiv C - R$ ,
original image
(d) $H_{2} C = {CH}_{2} \overset{{Br}_{2} / {CCl}_{4}}{⟶} Br \cdot N_{2} C - {CH}_{2} Br$
This reaction is electrophilic addition reaction. So, the option (b) is correct.

AP EAPCET 24.08.2021 Shift-II

Hydrocarbons

230091 Assertion (A): Sodium acetate on Kolbe's electrolysis gives ethane.
Reason (B) Methyl free radical is formed at cathode

1 Both

A

and

R

are true and

R

is a correct explanation for

A

2 Both

A

and

R

are true but

R

is not a correct explanation for

A

3

A

is true,

R

is false

4

A

is false,

R

is true

Explanation:

: An aqueous solution of sodium acetate on electrolysis gives alkane i.e. ethane.
$\begin{aligned} \underset{sotumactate}{2 {CH}_{3} OONa} + 2 H_{2} O \overset{Electruysis}{⟶} {CH}_{3} - {CH}_{3} + & 2 {CO}_{2} + H_{2} \\ + 2 NaOH \end{aligned}$
Hence, first statement is true.
At cathode reaction takes place which is given as -
$\begin{array}{r} H_{2} O + e^{8} ⟶ {OH}^{*} + H^{∙} \\ Hydro gen free radical \end{array}$
In this reaction, hydrogen free radical are formed.

AP EAPCET 19-08-2021 Shift-I

Hydrocarbons

230092 The chlorination of ethane is an example which type of the following reactions?

1 Nucleophilic substitution

2 Electrophilic substitution

3 Free radical substitution

4 Rearrangement

Explanation:

: Chlorination of ethane take place by free radical substitution in the presence of light, in three steps to form ethyl chloride.
Step-I- Initiation step ${Cl}_{2} \overset{hv}{⟶} 2 \dot{C} 1$
Step-II- Propagation step
original image
Step-III-Termination Step

AP EAMCET (Engg.) 2012

Hydrocarbons

230110 Which of the following aqueous solutions should have the minimum boiling point?

1

0.1 M

Urea

2

0.1 M K_{2} {SO}_{4}

3

0.1 M NaCl

4

0.1 M {FeCl}_{3}

Explanation:

: The boiling point of compounds depends upon the van't Hoff factor. The van't Hoff factor is equal to the number of discrete ions in a formula unit of the substance.
$\begin{array}{ll} {NH}_{2} {CONH}_{2} \to {NH}_{2} {CONH}^{-} + H^{+} & i = 1 \\ K_{2} {SO}_{4} \to 2 K^{+} + {SO}_{4}^{2 -} & i = 3 \\ NaCl \to {Na}^{+} + {Cl}^{-} & i = 2 \\ {FeCl}_{3} \to {Fe}^{3 +} + 3 {Cl}^{-} & i = 4 \end{array}$
Hence, aqueous solution of urea is a covalent compound it show minimum boiling point.

GUJCET-2021

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