NEET

For
(i)I^–,
(ii) Cl^–,
(iii) Br^–, the increasing order of nucleophilicity would be

Cl^- < Br^- < I^-
I^- < Cl^- < Br^-
Br^- < Cl^- < I^-
I^- < Br^- < Cl^-

Solution

Nucleophilicity increases down the periodic table. I^- > Br^- > Cl^- > F^-

a
b
c
d

Solution

Example of chain isomerism are:

Ortho and meta toluic acids
Methyl acetate and ethyl formate
Pentanoic acid and 2-methyl butanoic acid
2-pentanone and 3-pentanone

Solution

Distillation is used to separate liquids which differ in the b.p by

5°C
10°C
30 – 80°C
100°C

Solution

Simple distillation can be applied for the separation and purification of a mixture of two or more liquids provided their boiling points differ at least by 30 K. In such cases, the low boiling (more volatile) liquid of the mixture will distil over first. The temperature of the distillation flask is then raised when high boiling (less volatile) liquid of the mixture will distil, it is collected in a separate flask.

A bottle containing two immiscible liquids is given to you.They may be separated by using a

Fractionating column
Separating funnel
Vacuum distillation
Steam distillation

Solution

Being immiscible liquids, they form different layers hence can be separated with the help of separating funnel.

a
b
c
d

Solution

– I group destablises carbocation and since inductive effect decreases with increasing length of carbon chain.Therefore (b) is the correct option.

1,2-Dihydroxybutane has the formula

C(OH) – C(OH) – C – C
C – C(OH)2– C – C
(OH)C – C – C – C(OH)
C – C(OH) – C(OH) – C

Solution

1,2-dihydroxybutane has longest carbon atom chain of 4 atoms and OH groups attached on it at first and second carbon atoms. So the choice (a) is correct.

(C), (B), (A), (D)
(B), (C), (A), (D)
(D), (C), (B), (A)
(A), (B), (C), (D)

Solution

Consider the acidity of the carboxylic acids :
(A)PhCOOH
(B)o-NO₂C₆H₄COOH
(C)p-NO₂C₆H₄COOH
(D)m-NO₂C₆H₄COOH

Which of the following order is correct ?

B > D > A > C
B> D > C > A
A> B > C > D
B> C > D > A

Solution

Impure glycerine can be purified by

Steam distillation
Simple distillation
Vacuum distillation
Extraction with a solvent

Solution

Simple distillation is suitable for liquids which boil without decomposition at atmospheric pressure. In case of liquids which decompose before their boiling point is reached, vaccum distillation is used. Glycerine decomposes at its boiling point (298°C) but can be distilled unchanged at 12 mm pressure at 180°C.

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