NEET

The following compound will undergo electrophilic substitution more readily than benzene :

Nitrobenzene
Benzoic acid
Benzaldehyde
Phenol

Solution

Due to + M effect of the – OH group in phenol, electron density in the ortho and para positions of the phenol nucleus increases hence phenol will undergo electrophilic substitution easily than benzene. The other three compounds have electron withdrawing groups,hence they will undergo electrophilic substitution with a difficulty than benzene.

A meta-directing functional group is :

— COOH
OH
—CH3
— Br

Solution

Which one of the following species is isoelectronic with ammonia ?

\(CH_{2}^{-}\)
⁺CH₂
^–CH₃
⁺CH₃

Solution

Isoelectronic species has same number of electrons.No. of electrons in different species

NH₃ = 7 + 3 = 10;

⁺CH₂ = 6 + 2 -1 = 7

^-CH₂ = 6 + 2 +1 = 9

^-CH₃ = 6 + 3 +1 = 10

⁺CH₃ = 6 + 3 - 1 = 8

The prussian blue colour obtained in the Lassaigne’s test for nitrogen is due to the formation of

Iron (II) hexacyanoferrate (III)
Iron (III) hexacyanoferrate (II)
Iron (III) hexacyanoferrate (III)
Iron (II) hexacyanoferrate (II)

Solution

Strongest acid among the following is :

CCl₃COOH
CH₃COOH
CF₃COOH
CBr₃COOH

Solution

CF₃COOH has highest acidity due to –I effect of F.

Which of the following is strongest nucleophile –

Br^-
: OH^-
:CN^-
\(c_{2}H_{5}\bar{O}:\)

Solution

The strength of nucleophile depends upon the nature of alkyl group R on which nucleophile has to attack and also on the nature of solvent. The order of strength of nucleophiles follows the order :CN^- > I^- > C₆H₅O^- > OH^- > Br^- > Cl^-

Steam distillation is used for the purification of:

covalent compounds
electrovalent compounds
co-ordinate compounds
volatile compounds

Solution

Steam distillation is used for the purification of volatile compounds.

a
b
c
d

Solution

a
b
c
d

Solution

Which one of the following does not have sp2 hybridized carbon ?

Acetonitrile
Acetic acid
Acetone
Acetamide

Solution

UnAttempted

0

Attempted

0

Correct

0

Wrong

0

Attempted

Correct

UnAttempted

Wrong