1
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

Treatment of cyclopentanone


with methyl lithium gives which of the following species ?
A
Cyclopentanonyl radical
B
Cyclopentanonyl biradical
C
Cyclopentanonyl anion
D
Cyclopentanonyl cation

Explanation

2
MCQ (Single Correct Answer)

AIPMT 2015

Which of the following is not the product of dehydration of

A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

AIPMT 2015

Which of the following statements is not correct for a nucleophile?
A
Ammonia is a nucleophile.
B
Nucleophiles attack low e$$-$$ density sites.
C
Nucleophiles are not electron seeking.
D
Nucleophile is a Lewis acid.

Explanation

Nucleophile is a species that provide electron while species which are deficient of electrons are termed as lewis acid, hence nucleophiles are usually lewis bases.
4
MCQ (Single Correct Answer)

AIPMT 2014

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is
A
37.33
B
45.33
C
35.33
D
43.33

Explanation

10 ml, 1 M H2SO4 = 20 ml, 1 M NH3

$$ \because $$ wt of N in one mole NH3 = 14

$$ \therefore $$ 20 × 10–3 mol NH3 $$ \to $$ 20 × 10–3 × 14 nitrogen

$$ \therefore $$ 0.75 g of sample contains = $${{14 \times 20 \times {{10}^{ - 3}}} \over {0.75}} \times 100$$

= 37.33%

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