Concept

Question 1

Wt happens in association and dissociation?

Answer 1

In association - obs value>true value

In dissociation - obs value<true value

Question 2

If in a ring both ortho, para and meta directing groups are their, i.e, both ERG and EWG then which play captain role?

Answer 2

ERG or ortho, para directing group.

Question 3

On exposure to hv Br forms?

Answer 3

Br radical
Benzyl>allyl>3°>2°>1°

Question 4

Wt is reaction quotient

Answer 4

Qc

Question 5

Hydroboration follows?

Answer 5

Antimarkovnikov rule

Question 6

Oxymercuration-demercuration follows?

Answer 6

Markovnikov rule

Question 7

Li^+ –> Li^2+ req more energy than Ne—>Ne^+ . Why?

Answer 7

Bc ‘s’ orbital is more close to the nucleus. So it req more energy to overcome the nuclear attraction.

Question 8

Increasing or decreasing volume when ∆ng=0

Answer 8

Has no effect on eq//m

Question 9

Increasing pressure when ∆ng=0 and ∆ng≠0

Answer 9

∆ng=0 no effect
∆ng≠0 eq//m shifts from lower moles to higher moles

Question 10

Formula for lewisite and mustard gas

Answer 10

Lewisite is a structurally complex mixture of several compounds produced by the catalyzed reaction of arsenic trichloride and acetylene, with a molecular formula of C2H2AsCl3

The chemical formula for mustard gas is C4H8Cl2S2

Question 11

Borax dissolves in water to give

Answer 11

Basic solution

Question 12

Ch4 + N2(electric arc) →

Answer 12

Ch4 + Hcn

Question 13

O.S is directly proportional to

Answer 13

Acidity

Question 14

For Sn1 and Sn2 which is stable

Answer 14

Sn1- 3° , Sn2- 1°

Question 15

Red P and white P, which is stable

Answer 15

Red P> white P

Question 16

In a
S
N
2
substitution reaction of the type
R
−
B
r
+
C
l
−
D
M
F
⟶
R
−
C
l
+
B
R
−

Which of the following has the highest relative rate ?

Answer 16

More the bulky substituents present around the carbon, more difficulty for the nucleophile to approach the carbon having leaving group. therefore the order of reactivity for alkyl halides is :
Methyl >Primary>Secondary>Tertiary

So,
C
H
3
C
H
2
B
r
has the highest relative rate.

Question 17

Wt is Drago’s rule

Answer 17

Except Nh3(sp3 107°) all others from P→Bi no hyb so BA is more for them
|||Ly
Except H20(sp3) remaining no hyb since only overlapping so BA is more for them.