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1

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)
On hydrolysis of a ''compound'', two compounds are obtained. One of which one treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollens reagent and Fehling's solution. The ''compound'' is
A
CH3CH2CH2NC
B
CH3CH2CH2CN
C
CH3CH2CH2ON $$=$$ O
D
CH3CH2CH2CON(CH3)2

Explanation

Hydrolysis of propyl isocyanide (CH3CH2CH2NC) gives CH3CH2CH2NH2 + HCOOH.

On treatment with NaNO2 and HCl I(CH3CH2CH2NH2) gives CH3CH2CH2OH which does not give iodoform test. II (HCOOH) reduces Tollen’s reagent and Fehling’s solution.
2

NEET 2013

MCQ (Single Correct Answer)
Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80$$-$$100oC forms which one of the following products?
A
1, 4-Dinitrobenzene
B
1, 2, 4 - Trinitrobenzene
C
1, 2-Dinitrobenzene
D
1, 3-Dinitrobenzene

Explanation

3

AIPMT 2012 Mains

MCQ (Single Correct Answer)
An organic compound (C3H9N) (A), when treated with nitrous acid, gave an alcohol and N2 gas was evolved. (A) on warming with CHCl3 and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure of (A)
A
B
CH3CH2 $$-$$ NH $$-$$ CH3
C
D
CH3CH2CH2 $$-$$ NH2

Explanation

As A gives alcohol on treatment with nitrous acid thus it should be primary amine. C3H9N has two possible structure with –NH2 group.



As it gives isopropylmethylamine thus it should be isopropyl amine not n-propyl amine.
4

AIPMT 2011 Prelims

MCQ (Single Correct Answer)
What is the product obtained in the following reaction?
A
B
C
D

Explanation

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