1

NEET 2017

The correct increasing order of basic strength for the following compounds is
A
III < I < II
B
III < II < I
C
II < I < III
D
II < III < I

Explanation

– NO2 group has strong – R effect and – CH3 shows +R effect.

$\therefore$ Order of basic strength is

2

NEET 2016 Phase 1

The product formed by the reaction of an aldehyde with a primary amine is
A
carboxylic acid
B
aromatic acid
C
Schiff's base
D
ketone

Explanation

3

NEET 2016 Phase 2

A given nitrogen-containing aromatic compound 'A' reacts with Sn/HCl, followed by HNO2 to give instable compound 'B'. 'B', on treatment with phenol, forms a beautiful coloured compound 'C' with the molecular formula C12H10N2O. The structure of compound 'A' is
A
B
C
D

Explanation

4

NEET 2016 Phase 1

The correct statement regarding the basicity of arylamines is
A
arylamines are generally more basic than alkalmines because of aryl group
B
arylamines are generally more basic than alkylmines, because the nitrogen atom in arylamines is sp-hybridised
C
arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalised by interaction with the aromatic ring $\pi$-electron system
D
arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalised by interaction with the aromatic ring $\pi$-electron system.

Explanation

In arylamines, lone pair of electrons on nitrogen atom is delocalized over the benzene ring, thus not available for donation so arylamine are less basic than alkylamines.