NEET

Which is formed when benzalamine react with nitrous acid

C₆H₅OH
C₆H₅ON
C₆H₅N₂OH
C₆H₅CH₂OH

Solution

When phenol is treated with excess bromine water. It gives

m-Bromophenol
o-and p-Bromophenols
2,4-Dibromophenol
2,4, 6-Tribromophenol.

Solution

The intermediate formed in aldol condensation is

aldol
carbanion
alcohol
α-hydrogen ester

Solution

When phenol is heated with CHCl₃ and NaOH then salicylaldehyde is produced. This reaction is known as

Rosenmund’s reaction
Reimer-Tiemann reaction
Friedel-Crafts reaction
Sommelet reaction

Solution

phenol
benzoic acid
salicylaldehyde
carbolic acid

Solution

Ethanol and dimethyl ether form a pair of functional isomers.The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of

H-bonding in ethanol
H-bonding in dimethyl ether
CH₃ group in ethanol
CH₃ group in dimethyl ether

Solution

Due to H–bonding boiling point of C₂H₅OH is much higher than isomeric (CH₃)₂O.

(i) and (ii)
(i), (iii) and (iv)
only (i)
(i), (ii)and (iii)

Solution

Among the given compounds only CH₃OH does not give iodo form reaction.

Solution

The intermediate is carbocation which is destabilised by C = O group (present on α-carbon to the –OH group) in the first three cases. In (d), α–hydrogen is more acidic which can be removed as water. Moreover,the positive charge on the intermediate carbocation is relatively away from the C= O group.

Benzene
Toluene
Salicylic acid
Benzoic acid

Solution

Glycerol is more viscous than ethanol due to

high molecular weight
high boiling point
many hydrogen bonds per molecule
Fajan’s rule

Solution

Because of larger (three per molecule) number of intermolecular hydrogen bonding in case of glycerol(CH₂OH –CHOH – CH₂OH ) as compared to ethanol(CH₃CH₂OH), the attraction between molecules of glycerol is more than that of molecules of ethanol. Due to this glycerol is more viscous than ethanol.

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