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–
In a given structure there are 4 -pi bonds.Hence, total number of pi electrons are 8.
Correct decreasing order of dipole moment of CH3F, CH3CI and CH3Br is
Bond length and (EN) oppose each other, with the larger halogens having longer bonds but weaker (EN). Thus CH3CI > CH3F > CH3Br.
Consider the following compounds
Q. Increasing order of dipole moment of these compounds is
Toluene with one —CH3 is less polar then m - and o-dichlorobenzene. Thus, IV < l < III < II.
Dipole moment of is 1.5 D. Thus, dipole moment
If one considers following molecule, it is
Symmetrical and thus
In the given species
Given for HCI and HI
Q. Ratio of fraction of electric charge existing on each atom in HCI and HI is
Ortho-isomers have dipole moments. In which cases dipole moments are maximum and minimum?
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
Which of the following is nonpolar but contains polar bonds?
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.
Bond length of H— Cl is 1.2476 Thus, its dipole moment is
PCIx F5 - x shows non-polar behaviour when x is
Which of the following bonds is the weakest?
van der Waals` force is the weakest force of attraction and covalent bond is the strongest. Correct order is
In which of the following sets of compounds dipole moment of I is larger than that of II?
Which of the following would have a permanent dipole?
(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
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?
CO, SO2, H2O, NH3 and HCI have polarity thus, have dipole moments.
Dipole moment is shown by
The molecules that will have dipole moment are
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.
Resultant dipole moment of CCI4 = 0.
CH4 is subjected to photochemical reaction and changes to CH3CI, CH2CI2, CHCI3 and CCI4.
Q. One of the intermediates of the photochemical reaction is
has one unpaired electron in unhybridised p-orbital.
Thus, sp2-hybridised paramagnetic.
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
Due to electronegativity difference between the bonded atoms. ICI, NO, SO2, CH2CI2, OCS are polar compounds.
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
CH2CI2,H2O,CHCI3,o-cresol, SCI2, IBr and HCHO (in all seven) have dipole moments.
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