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Hydrocarbons

17509 Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe

1 Glycerol

2 Glycol

3

1, 2 -

dibromoethane

4 Benzene

Explanation:

(c) $P b (C_{2} H_{5})_{4} \overset{h e a t}{⟶} P b + \underset{E t h y l r a d i c a l}{4 C H_{3} C H_{2}^{}}$
$\begin{matrix} C H_{2} - C H_{2} \\ | | \\ B r B r \end{matrix}$ $+ P b \to \underset{E t h e n e}{C H_{2} = C H_{2}} + \underset{L e a d b r o m i d e}{P b B r_{2}}$
As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine

Hydrocarbons

18173 Which of the following isomeric structure have lowest energy?

1

2

3

4

Explanation:

$A \to 1, 2 a a, B \to 1, 4 a a, C \to 1, 3 a e, D \to 1, 3 e e$

Hydrocarbons

18174 Identify total number of mono chlorinated products when $2 -$ methyl pentane react with $C l_{2} / h v$ ?

1

5

2

6

3

8

4

9

Hydrocarbons

18175 The major product of the reaction is

1

2

3

4

Hydrocarbons

17509 Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe

1 Glycerol

2 Glycol

3

1, 2 -

dibromoethane

4 Benzene

Explanation:

(c) $P b (C_{2} H_{5})_{4} \overset{h e a t}{⟶} P b + \underset{E t h y l r a d i c a l}{4 C H_{3} C H_{2}^{}}$
$\begin{matrix} C H_{2} - C H_{2} \\ | | \\ B r B r \end{matrix}$ $+ P b \to \underset{E t h e n e}{C H_{2} = C H_{2}} + \underset{L e a d b r o m i d e}{P b B r_{2}}$
As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine

Hydrocarbons

18173 Which of the following isomeric structure have lowest energy?

1

2

3

4

Explanation:

$A \to 1, 2 a a, B \to 1, 4 a a, C \to 1, 3 a e, D \to 1, 3 e e$

Hydrocarbons

18174 Identify total number of mono chlorinated products when $2 -$ methyl pentane react with $C l_{2} / h v$ ?

1

5

2

6

3

8

4

9

Hydrocarbons

18175 The major product of the reaction is

1

2

3

4

Hydrocarbons

17509 Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe

1 Glycerol

2 Glycol

3

1, 2 -

dibromoethane

4 Benzene

Explanation:

(c) $P b (C_{2} H_{5})_{4} \overset{h e a t}{⟶} P b + \underset{E t h y l r a d i c a l}{4 C H_{3} C H_{2}^{}}$
$\begin{matrix} C H_{2} - C H_{2} \\ | | \\ B r B r \end{matrix}$ $+ P b \to \underset{E t h e n e}{C H_{2} = C H_{2}} + \underset{L e a d b r o m i d e}{P b B r_{2}}$
As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine

Hydrocarbons

18173 Which of the following isomeric structure have lowest energy?

1

2

3

4

Explanation:

$A \to 1, 2 a a, B \to 1, 4 a a, C \to 1, 3 a e, D \to 1, 3 e e$

Hydrocarbons

18174 Identify total number of mono chlorinated products when $2 -$ methyl pentane react with $C l_{2} / h v$ ?

1

5

2

6

3

8

4

9

Hydrocarbons

18175 The major product of the reaction is

1

2

3

4

Hydrocarbons

17509 Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe

1 Glycerol

2 Glycol

3

1, 2 -

dibromoethane

4 Benzene

Explanation:

(c) $P b (C_{2} H_{5})_{4} \overset{h e a t}{⟶} P b + \underset{E t h y l r a d i c a l}{4 C H_{3} C H_{2}^{}}$
$\begin{matrix} C H_{2} - C H_{2} \\ | | \\ B r B r \end{matrix}$ $+ P b \to \underset{E t h e n e}{C H_{2} = C H_{2}} + \underset{L e a d b r o m i d e}{P b B r_{2}}$
As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine

Hydrocarbons

18173 Which of the following isomeric structure have lowest energy?

1

2

3

4

Explanation:

$A \to 1, 2 a a, B \to 1, 4 a a, C \to 1, 3 a e, D \to 1, 3 e e$

Hydrocarbons

18174 Identify total number of mono chlorinated products when $2 -$ methyl pentane react with $C l_{2} / h v$ ?

1

5

2

6

3

8

4

9

Hydrocarbons

18175 The major product of the reaction is

1

2

3

4

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