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Test: Dipole Moment - NEET MCQ


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Test: Dipole Moment - Question 1

Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Number of π bonds in the following structure is–

Detailed Solution for Test: Dipole Moment - Question 1

In a given structure there are 4 -pi bonds.Hence, total number of pi electrons are 8.

Test: Dipole Moment - Question 2

Correct decreasing order of dipole moment of CH3F, CH3CI and CH3Br is

Detailed Solution for Test: Dipole Moment - Question 2




Bond length and (EN) oppose each other, with the larger halogens having longer bonds but weaker (EN). Thus CH3CI > CH3F > CH3Br.

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Test: Dipole Moment - Question 3

Consider the following compounds

Q. Increasing order of dipole moment of these compounds is 

Detailed Solution for Test: Dipole Moment - Question 3



Toluene with one —CH3 is less polar then m - and o-dichlorobenzene. Thus, IV < l < III < II.

Test: Dipole Moment - Question 4

Dipole moment of   is 1.5 D. Thus, dipole moment 

Detailed Solution for Test: Dipole Moment - Question 4

 If one considers following molecule, it is 


Symmetrical and thus
In the given species

Test: Dipole Moment - Question 5

Given for HCI and HI 

Q. Ratio of fraction of electric charge existing on each atom in HCI and HI is

Detailed Solution for Test: Dipole Moment - Question 5



Test: Dipole Moment - Question 6

Ortho-isomers have dipole moments. In which cases dipole moments are maximum and minimum?

Detailed Solution for Test: Dipole Moment - Question 6




Larger the value of θ, smaller the value of μ. Dipole-dipole repulsion (due to large groups (as Cl, Cl) increases , thus decreases p.
Intramolecular H-bonding (as OH and NO2) decreases θ, thus increases μ.

Repulsion
(Cl—Cl) > (OH—OH) > (CH3—CH3)
Thus, μ is minimum when X = V = Cl and μ is maximum when X = OH
Y = NO2

Test: Dipole Moment - Question 7

Which of the following is nonpolar but contains polar bonds?

Detailed Solution for Test: Dipole Moment - Question 7

Carbon dioxide CO2 has polar bonds but is a nonpolar molecule. The structure of CO2 is linear. The individual bond dipoles cancel each other as they point in opposite direction and are equal in magnitude. Hence, the molecule is non polar with zero dipole moment.

Test: Dipole Moment - Question 8

Bond length of H— Cl is 1.2476 Thus, its dipole moment is

Detailed Solution for Test: Dipole Moment - Question 8



Test: Dipole Moment - Question 9

PCIx F5 - x shows non-polar behaviour when x is

Detailed Solution for Test: Dipole Moment - Question 9


The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because the configuration of PF5 has trigonal bipyramidal, and PF5 consists of a central phosphorus atom, surrounded by five fluorine atoms. So the three planar fluorine’s electronegativity cancels out each other, which resulting PF5 is a nonpolar molecule.

similarly, in PClcase chlorine's electronegativity cancels out each other.

 In case of PCl3​F2​, the molecule is non-polar, even though the fluorine atoms are slightly more electro-negative than the chlorine. This could be explain in a couple ways. The more intuitive approach is to consider how the presence of two fluorine atoms would create symmetry. The less intuitive, but more accurate, process would be to realize that the structure of the molecule is divided in to two non-polar structure(trigonal planer and linear). With other molecules, like PF3​Cl2​ it's not possible to divide it in to non-polar shapes. The repulsion between the fluorine atom is greater than that between the chlorine. Thus PF3​Cl2​ is polar.

 

Test: Dipole Moment - Question 10

Which of the following bonds is the weakest?

Detailed Solution for Test: Dipole Moment - Question 10

van der Waals` force is the weakest force of attraction and covalent bond is the strongest. Correct order is 

Test: Dipole Moment - Question 11

 In which of the following sets of compounds dipole moment of I is larger than that of II?

Detailed Solution for Test: Dipole Moment - Question 11



Test: Dipole Moment - Question 12

Which of the following would have a permanent dipole?

Detailed Solution for Test: Dipole Moment - Question 12


(c) SF4 has one lone pair making it polar permanently.

sp3d-hybridised S-atom.
(d) XeF4 has two lone pairs in opposite side thus μ = 0 

*Multiple options can be correct
Test: Dipole Moment - Question 13

Direction (Q. Nos. 13-15) This section contains 4 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

Q. Which of the following has/have zero dipole moments?

Detailed Solution for Test: Dipole Moment - Question 13





CO, SO2, H2O, NH3 and HCI have polarity thus, have dipole moments.

*Multiple options can be correct
Test: Dipole Moment - Question 14

Dipole moment is shown by 

Detailed Solution for Test: Dipole Moment - Question 14


*Multiple options can be correct
Test: Dipole Moment - Question 15

The molecules that will have dipole moment are

Detailed Solution for Test: Dipole Moment - Question 15


Test: Dipole Moment - Question 16

Direction (Q. Nos. 16-17) This section contains  a paragraph, each describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given options (a),(b),(c),(d).

CH4 is subjected to photochemical reaction and changes to CH3CI, CH2CI2, CHCI3 and CCI4.

Q. 
Select the correct alternate.

Detailed Solution for Test: Dipole Moment - Question 16


Resultant dipole moment of CCI4 = 0.

Test: Dipole Moment - Question 17

CH4 is subjected to photochemical reaction and changes to CH3CI, CH2CI2, CHCI3 and CCI4.

Q. One of the intermediates of the photochemical reaction is

Detailed Solution for Test: Dipole Moment - Question 17


 has one unpaired electron in unhybridised p-orbital.
Thus, sp2-hybridised paramagnetic.

*Answer can only contain numeric values
Test: Dipole Moment - Question 18

Direction (Q. Nos. 18 and 19) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive).

Q. How many of the following molecules are polar?

Cl2, ICI, BF3, NO, SO2
XeF4, CH2CI2, OCS, CO2


Detailed Solution for Test: Dipole Moment - Question 18

Due to electronegativity difference between the bonded atoms. ICI, NO, SO2, CH2CI2, OCS are polar compounds.




*Answer can only contain numeric values
Test: Dipole Moment - Question 19

How many molecules out of the following have non-zero value of dipole moments?

CH2CI2, CH4, CCI4, H2O, CHCI3, p-dichloro benzene, o-cresol, p-xylene, SCI2, BF3, IBr, HCHO


Detailed Solution for Test: Dipole Moment - Question 19

CH2CI2,H2O,CHCI3,o-cresol, SCI2, IBr and HCHO (in all seven) have dipole moments.

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