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Pericyclic Re...

Pericyclic Reaction

Trending Questions

Q. Which of the following is not a suitable initiator for free radical addition polymerisation reaction?

Acetyl peroxide
Benzoyl peroxide
tert-Butyl peroxide
Benzoquinone

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Q.

What is meant by sn1, sn2, sn3 reactions explain briefly and give difference between them and state 10 examples each

Question is for 7 marks

So please keep it somewhat big

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Q.

Diels - Alder reaction is an example of:

Substitution
Pericyclic
Addition
Polymerization

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Q. In free radical mechanism, the step in which two very large free radicals combine with each other is called the ____ step.

chain initiating
chain propagating
chain growth
chain terminating

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Q.

Formation of ethylene from acetylene is an example of :

racemisation reaction
Elimination reaction
Substitution reaction
Addition reaction

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Q.

Diels - Alder reaction is an example of:

Polymerization
Pericyclic
Addition
Substitution

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Q. Pericylic reactions involve free radical intermediates

False
True

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Q.

The reaction $(C H_{3})_{3} C$ -Br+ water ------- $>$ t-Butyl alcohol is:

Elimination reaction
Substitution reaction
Displacement reaction
Free radical reaction

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Q.

Assume general laboratory reagents and butadiene are available.
Which of the following sequences could accomplish the following synthesis?

1: Dissolved metal reduction of butadiene;
2; Catalytic hydrogenation
1: Kolbe's electrolysis;
2; Catalytic hydrogenation
1: Stephen's aldehyde synthesis;
2; Catalytic hydrogenation
1: Diels-Alder of butadiene and the substrate;
2; Catalytic hydrogenation

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Q. When iodine reacts with

NaF, NaBr and NaCl

It gives mixture of $F_{2}, C l_{2}$ and $B r_{2}$
It gives chlorine
It gives bromine
None of these

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Q.

Assume general laboratory reagents and butadiene are available.
Which of the following sequences could accomplish the following synthesis?

1: Dissolved metal reduction of butadiene;
2; Catalytic hydrogenation
1: Kolbe's electrolysis;
2; Catalytic hydrogenation
1: Stephen's aldehyde synthesis;
2; Catalytic hydrogenation
1: Diels-Alder of butadiene and the substrate;
2; Catalytic hydrogenation

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Q. Which of the following statements is/are wrong about pericyclic reaction ?

It is intramolecular cyclisation of acyclic compound.
It is intermolecular cyclisation of acyclic compound.
It proceeds via concerted mechanism in which breaking and formation of bonds take place simulataneusly.
It Proceeds via free-radical mechanism.

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Q. Pericylic reactions involve free radical intermediates

True
False

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Q.

The reaction $(C H_{3})_{3} C$ -Br+ water ------- $>$ t-Butyl alcohol is:

Elimination reaction
Substitution reaction
Free radical reaction
Displacement reaction

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Q. C +H2SO4 gives

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Q. Excess of

K I

reacts with

C u S O_{4}

solution and then

N a_{2} S_{2} O_{3}

solution is added to it. Which of the following statements is incorrect for this reaction?

$C u I_{2}$ is formed.
Evolved $I_{2}$ is reduced by $N a_{2} S_{2} O_{3}$ .
$C u_{2} I_{2}$ is formed.
$N a_{2} S_{2} O_{3}$ is oxidised.

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Q.

Assume general laboratory reagents and butadiene are available.
Which of the following sequences could accomplish the following synthesis?

1: Stephen's aldehyde synthesis;
2; Catalytic hydrogenation
1: Dissolved metal reduction of butadiene;
2; Catalytic hydrogenation
1: Kolbe's electrolysis;
2; Catalytic hydrogenation
1: Diels-Alder of butadiene and the substrate;
2; Catalytic hydrogenation

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Q.

Formation of ethylene from acetylene is an example of :

Elimination reaction
Substitution reaction
Addition reaction
racemisation reaction

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Q. In-OCH3 and -CN does -CNO3 has more +I effect??

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Q. Which of the following reaction can produce aniline as main product?

$C_{6} H_{5} N O_{2} + Z n / K O H$
$C_{6} H_{5} N O_{2} + Z n / N H_{4} C l$
$C_{6} H_{5} N O_{2} + L i A I H_{4}$
$C_{6} H_{5} N O_{2} + Z n / H C l$

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Q. Complete and balance the following compound

C a_{5} (P O_{4})_{3} F + H_{2} S O_{4} + H_{2} O H e a t \to

_______

+ C a S O_{4} \cdot 2 H_{2} O +

______.

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Q.

Consider following reactions:

I.

[C o (N H_{3})_{6}]^{3 +} (a q) + 6 H_{3} O^{+} (a q) ⇌ [C o (H_{2} O)_{6}]^{3 +} (a q) + 6 N H_{4}^{+} (a q)

The products are favoured in the above reaction.

II.

[C o (N H_{3})_{6}]^{2 +} (a q) + 6 H_{3} O^{+} (a q) \to [C o (H_{2} O)_{6}]^{2 +} (a q) + 6 N H_{4}^{+} (a q)

The reactions (II) takes place with

H_{2} O

in a matter of seconds.

Select correct statement:

$[C o (N H_{3})_{6}]^{3 +}$ is thermodynamically and kinetically stable relative to $[C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}$ is thermodynamically unstable but kinetically stable relative to $[C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}$ is thermodynamically and kinetically unstable relative to $[C o (H_{2} O)_{6}]^{3 +}$
$[C o (N H_{3})_{6}]^{3 +}$ is thermodynamically stable but kinetically unstable relative to $[C o (H_{2} O)_{6}]^{3 +}$

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Q. Which of the following reaction is possible?

$B r_{2} + 2 N a C l \to 2 N a B r + {C l}_{2}$
${C l}_{2} + 2 N a B r \to 2 N a C l + B r_{2}$
$I_{2} + 2 N a B r \to 2 N a I + B r_{2}$
$I_{2} + 2 N a C 1 \to N a I C 1_{2}$

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