Test: Conformational Analysis- 2


14 Questions MCQ Test Chemistry Class 11 | Test: Conformational Analysis- 2


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*Multiple options can be correct
QUESTION: 1

Direction (Q. Nos. 1- 8) This section contains 8 multiple choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

 

Q.

Among the butane conformers, when viewed about C2-C3 bond, which occur at energy minima on a graph of potential energy versus dihedral angle? 

Solution:
*Multiple options can be correct
QUESTION: 2

The correct statement regarding cyclopropane is/are

Solution:

The correct answers are Options A and C. 
In cyclopropane the angle strain is maximum. Hence, it is a highly strained molecule and consequently most unstable.In cyclopropane, the adjacent CH2 groups are also eclipsed. Unlike in ethane, this strain cannot be relieved through rotation (the ring is too rigid).  In other words, the CH2 groups are locked in the eclipsed conformation, which results in torsional strain – much like a propeller that has been wound up but held in position.
 

*Multiple options can be correct
QUESTION: 3

Select the correct statement(s) concerning conformers of ethane and hexachloroethane? 

Solution:
*Multiple options can be correct
QUESTION: 4

The correct statement concerning various conformers of 2-fluoroethanol is/are

Solution:
*Multiple options can be correct
QUESTION: 5

Consider the various conformers possible for meso form and enantiomeric 1,2-dibromo-1,2-dichloroethane and select the correct statement(s).

Solution:
*Multiple options can be correct
QUESTION: 6

Select the correct statement(s) regarding conformers of 1,2-dimethyl cyclohexane.

Solution:
*Multiple options can be correct
QUESTION: 7

The correct statement regarding conformation in butane is/are

Solution:
*Multiple options can be correct
QUESTION: 8

the correct statement(s) concerning the following Newmann's projection is/are 

Solution:
QUESTION: 9

Direction (Q. Nos. 9-14) This section contains 2 paragraph, wach describing  theory, experiments, data etc. three Questions related to paragraph have been  given.Each question have only one correct answer among the four given  ptions  (a),(b),(c),(d)
 

Passage I

The two major contributors of conformers of 1,2-dichloroethane are anti and gauche. At 32°C in gas phase, the measured dipole moment of 1,2-dichloroethane is 1.12 D. The dipole moment of a mixture of X and Y is given by the relationship 

Here, N = mole fraction of each kind of molecule. From bond moment measurement, it has been estimated that gauche conformer of 1,2-dichloroethane should have a dipole moment of about 3.2 D. 

Q. 

What per cent of conformers of 1,2-dichloroethane is anti, at 32°C? 

Solution:
QUESTION: 10

Passage I

The two major contributors of conformers of 1,2-dichloroethane are anti and gauche. At 32°C in gas phase, the measured dipole moment of 1,2-dichloroethane is 1.12 D. The dipole moment of a mixture of X and Y is given by the relationship 

Here, N = mole fraction of each kind of molecule. From bond moment measurement, it has been estimated that gauche conformer of 1,2-dichloroethane should have a dipole moment of about 3.2 D. 

Q.
What is true about percentage of gauche conformer?

Solution:
QUESTION: 11

Passage I

The two major contributors of conformers of 1,2-dichloroethane are anti and gauche. At 32°C in gas phase, the measured dipole moment of 1,2-dichloroethane is 1.12 D. The dipole moment of a mixture of X and Y is given by the relationship 

Here, N = mole fraction of each kind of molecule. From bond moment measurement, it has been estimated that gauche conformer of 1,2-dichloroethane should have a dipole moment of about 3.2 D. 

Q. 

What happens if temperature if increased to 52°C?

Solution:
QUESTION: 12

Passage II
 

Among conformers, the barrier to rotation originate mainly from torsional strain when atoms or groups eclipse one another. Followings are the costs of energy required to cross the rotational barrier for the indicated pair of groups eclipsing 
 

Q.

What is the energy barrier to rotation in neopentane ?

Solution:
QUESTION: 13

Passage II
 

Among conformers, the barrier to rotation originate mainly from torsional strain when atoms or groups eclipse one another. Followings are the costs of energy required to cross the rotational barrier for the indicated pair of groups eclipsing 
 

Q.

What is the energy barrier to rotation in 2-methyl propane ?

Solution:

The correct answer is Option D.

QUESTION: 14

Passage II
 

Among conformers, the barrier to rotation originate mainly from torsional strain when atoms or groups eclipse one another. Followings are the costs of energy required to cross the rotational barrier for the indicated pair of groups eclipsing 

 

Q.

What is the energy difference between two eclipsed conformers of butane when viewed between C2-C3 bond ?

Solution:

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