CameraIcon

SearchIcon

MyQuestionIcon

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

drop_down_image

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

drop_down_image

Q.

Diels - Alder reaction is an example of:

Substitution
Pericyclic
Addition
Polymerization

drop_down_image

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

drop_down_image

Q.

Formation of ethylene from acetylene is an example of :

racemisation reaction
Elimination reaction
Substitution reaction
Addition reaction

drop_down_image

Q.

Diels - Alder reaction is an example of:

Polymerization
Pericyclic
Addition
Substitution

drop_down_image

Q. Pericylic reactions involve free radical intermediates

False
True

drop_down_image

Q.

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

Elimination reaction
Substitution reaction
Displacement reaction
Free radical reaction

drop_down_image

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

drop_down_image

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

drop_down_image

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

drop_down_image

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.

drop_down_image

Q. Pericylic reactions involve free radical intermediates

True
False

drop_down_image

Q.

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

Elimination reaction
Substitution reaction
Free radical reaction
Displacement reaction

drop_down_image

Q. C +H2SO4 gives

drop_down_image

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.

drop_down_image

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

drop_down_image

Q.

Formation of ethylene from acetylene is an example of :

Elimination reaction
Substitution reaction
Addition reaction
racemisation reaction

drop_down_image

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

drop_down_image

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

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

drop_down_image

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 +

______.

drop_down_image

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 $[C o (H_{2} O)_{6}]^{3 +}$

drop_down_image

Q. Which of the following reaction is possible?

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

drop_down_image