1
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

In which of the following compounds, the C$$-$$Cl bond ionisation shall give most stable carbonium ion?
A
B
C
D

Explanation

Tertiary butyl chloride will give the most stable tertiary carbonium ion among the other given compounds due to hyperconjugation.
2
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
A
16.75
B
15.76
C
17.36
D
18.20

Explanation

Wt. of organic substance = 0.25 g

V1 = 40 mL, T1 = 300 K

P1 = 725 – 25 = 700 mm of Hg

P2 = 760 mm of Hg (at STP)

T2 = 273 K

$${{{P_1}{V_1}} \over {{T_1}}} = {{{P_2}{V_2}} \over {{T_2}}}$$

V2 = $${{700 \times 40 \times 273} \over {300 \times 760}}$$ = 33.52 mL

Percentage of nitrogen

= $${{28 \times 33.52 \times 100} \over {22400 \times 0.25}}$$

= 16.76%
3
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?
A
B
C
D

Explanation

$$\pi $$ bond is transferred after leaving Cl then nucleophile will attack a stable carbocation.

4
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

Given :

Which of the given compounds can exhibit tautomerism?
A
II and III
B
I, II and III
C
I and II
D
I and III

Explanation



In first two cases $$\alpha $$-H participates in tautomerism.

And in third case, $$\gamma $$-H participate in tautomerism.

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