Dipole Moment & Hydrogen Bonding — Practice Questions

Free NEET Chemistry multiple-choice questions on Dipole Moment & Hydrogen Bonding. Attempt each question and reveal the answer with a full explanation.

The high boiling point of HF compared to other hydrogen halides is primarily due to: Extensive intermolecular hydrogen bonding Highest bond dissociation enthalpy Strongest Van der Waals forces Lowest molecular mass Which of the following is a polar molecule? BF3 SF4 SiF4 XeF4 Which of the following molecules has the maximum dipole moment ? CO2 CH4 NH3 NF3 Which of the following is a cationic detergent? Sodium stearate Cetyltrimethyl ammonium bromide Sodium dodecylbenzene sulphonate Sodium lauryl sulphate Polar molecules are the molecules Acquire a dipole moment only in the presence of electric field due to displacement of charges Acquire a dipole moment only when magnetic field is absent Having a permanent electric dipole moment Having zero dipole moment Which of the following molecules is non-polar in nature? CH 2O SbCl 5 NO 2 POCl 3 Intermolecular forces are forces of attraction and repulsion between interacting particles that will include : A. dipole - dipole forces B. dipole - induced dipole forces C. hydrogen bonding D. covalent bonding E. dispersion forces Choose the most appropriate answer from the options given below : B, C, D, E are correct A, B, C, D are correct A, B, C, E are correct A, C, D, E are correct Intramolecular hydrogen bonding is present in HF The dipole moment of NF 3 is much lower than that of NH 3 because: In NF 3 , the orbital dipole and bond dipoles are in opposite directions In NH 3 , the orbital dipole and bond dipoles are in opposite directions Nitrogen is more electronegative than Fluorine Fluorine is less electronegative than Hydrogen Which of the following molecules has a non-zero dipole moment? cis-1,2-dichloroethene trans-1,2-dichloroethene BF 3 CO 2 Intermolecular hydrogen bonding is strongest in: p-Nitrophenol o-Nitrophenol Methanol Phenol Hydrogen bonding is notably absent in which of the following compounds? H 2S NH 3 H 2O HF The dipole moment of p -dichlorobenzene is zero, while that of o -dichlorobenzene is maximum. This is because: The bond dipoles in the para-isomer cancel by vector addition. The ortho-isomer is more electronegative. The meta-isomer has more resonance. The para-isomer is non-planar. The boiling point of p -nitrophenol is higher than that of o -nitrophenol because: p -nitrophenol has intermolecular hydrogen bonding. o -nitrophenol has intermolecular hydrogen bonding. p -nitrophenol has intramolecular hydrogen bonding. The nitro group in the p -position is more electron-withdrawing. Which of the following is the correct order of the solubility of alkaline earth metal sulfates in water? BeSO 4 > MgSO 4 > CaSO 4 > SrSO 4 > BaSO 4 BaSO 4 > SrSO 4 > CaSO 4 > MgSO 4 > BeSO 4 MgSO 4 > BeSO 4 > CaSO 4 > BaSO 4 > SrSO 4 CaSO 4 > BaSO 4 > BeSO 4 > MgSO 4 > SrSO 4 Identify the correct order of dipole moments for the following molecules: CH 3Cl, CH 2Cl 2, CHCl 3, CCl 4 . CH 3Cl > CH 2Cl 2 > CHCl 3 > CCl 4 CCl 4 > CHCl 3 > CH 2Cl 2 > CH 3Cl CH 3Cl > CHCl 3 > CH 2Cl 2 > CCl 4 CH 2Cl 2 > CH 3Cl > CHCl 3 > CCl 4 The correct order of bond dissociation enthalpy for the halogens is: Cl 2 > Br 2 > F 2 > I 2 F 2 > Cl 2 > Br 2 > I 2 Cl 2 > F 2 > Br 2 > I 2 I 2 > Br 2 > Cl 2 > F 2 Which of the following isomer pairs will have a non-zero dipole moment in its cis form but a zero dipole moment in its trans form? 1,2 -dichloroethene 1,2 -dimethylbenzene 2 -butene 1,1 -dichloroethene Identify the correct order of dipole moments for the methyl halides: CH 3Cl > CH 3F > CH 3Br > CH 3I CH 3F > CH 3Cl > CH 3Br > CH 3I CH 3Cl > CH 3Br > CH 3F > CH 3I CH 3I > CH 3Br > CH 3Cl > CH 3F The compound potassium bifluoride ( KHF 2 ) contains which of the following types of bonds? Ionic and Hydrogen bonds Ionic and Covalent bonds only Covalent and Coordinate bonds only Only Covalent bonds Which of the following is the correct order of dipole moments for methyl halides? CH 3Cl > CH 3F > CH 3Br > CH 3I CH 3F > CH 3Cl > CH 3Br > CH 3I CH 3Cl > CH 3Br > CH 3F > CH 3I CH 3I > CH 3Br > CH 3Cl > CH 3F Compared to H 2O , D 2O (Heavy Water) has a stronger hydrogen bond. This results in D 2O having a: Higher boiling point Lower boiling point Lower density Lower viscosity Which of the following substances has the highest boiling point? H 2O H 2S H 2Se H 2Te Which of the following shows the correct order of decreasing boiling points? H 2O > HF > NH 3 > PH 3 HF > H 2O > NH 3 > PH 3 H 2O > NH 3 > HF > PH 3 PH 3 > NH 3 > HF > H 2O Which of the following sets of molecules will have zero dipole moment? Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene Which of the following shows the correct order of increasing boiling points for the Group 16 hydrides? H 2S < H 2Se < H 2Te < H 2O H 2O < H 2S < H 2Se < H 2Te H 2Te < H 2Se < H 2S < H 2O H 2S < H 2O < H 2Se < H 2Te Maximum number of hydrogen bonds formed by a single water molecule is: 4 2 3 1 Which of the following contains both polar and non-polar bonds? H 2O 2 NH 4Cl HCl CH 4 Intramolecular hydrogen bonding is found in: o-Nitrophenol m-Nitrophenol p-Nitrophenol Phenol The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because:- In NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction In NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions In NH3 as well as NF3 the atomic dipole and bond dipole are in opposite directions In NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction Which of the following set of molecules will have zero dipole moment? Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene Given below are two statements: Statement I: The boiling point of hydrides of Group 16 elements follow the order H2O > H2Te > H2Se > H2S . Statement II: On the basis of molecular mass, H2O is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in H2O , it has higher boiling point. In the light of the above statements, choose the correct answer from the options given below: Both Statement I and Statement II are true Both Statement I and Statement II are false Statement I is true but Statement II is false Statement I is false but Statement II is true The dipole moment of chlorobenzene is 1.5 D . The dipole moment of 1,2 -dichlorobenzene is expected to be: 2.6 D 1.5 D 0 D 3.0 D The strength of a hydrogen bond is determined by the electronegativity of the atoms. Which of the following shows the correct decreasing order of hydrogen bond strength? F-H...F > O-H...O > N-H...N N-H...N > O-H...O > F-H...F O-H...O > F-H...F > N-H...N F-H...F > N-H...N > O-H...O The correct sequence of bond enthalpy of 'X-X' bond is: Cl-Cl > Br-Br > F-F > I-I F-F > Cl-Cl > Br-Br > I-I Cl-Cl > F-F > Br-Br > I-I I-I > Br-Br > Cl-Cl > F-F The dipole moment of H 2O is 1.85 D , whereas that of F 2O is only 0.30 D , although Fluorine is more electronegative than Oxygen. This is because: The lone pair dipole and bond pair dipoles oppose each other in F 2O . The lone pair dipole and bond pair dipoles reinforce each other in F 2O . Oxygen is sp 2 hybridized in F 2O . The F-O-F bond angle is 180 . The strongest hydrogen bond is present in: KHF 2 HF H 2O NH 3 Which of the following has the highest dipole moment despite the lower electronegativity of the halogen atom compared to Fluorine? CH 3Cl CH 3F CH 3Br CH 3I Which of the following methyl halides has the highest dipole moment? CH 3Cl CH 3F CH 3Br CH 3I Which of the following statements regarding Carbon Monoxide ( CO ) is true? It has a small dipole moment with the negative end on Carbon It has a large dipole moment with the negative end on Oxygen It has zero dipole moment due to its linear shape It has a triple bond consisting of three bonds Which of the following shows the correct order of decreasing dipole moment? CH 3Cl > CH 3F > CH 3Br > CH 3I CH 3F > CH 3Cl > CH 3Br > CH 3I CH 3Cl > CH 3Br > CH 3F > CH 3I CH 3F > CH 3Cl > CH 3I > CH 3Br Identify the correct orders against the property mentioned A. H2O > NH3 > CHCl3 – dipole moment B. XeF4 > XeO3 > XeF2 – number of lone pairs on central atom C. O–H > C–H > N–O – bond length D. N2 > O2 > H2 – bond enthalpy Choose the correct answer from the options given below: B, C only A, D only B, D only A, C only The correct order of hydrogen bond strength is: H F > H O > H N H N > H O > H F H O > H F > H N H F > H N > H O Which of the following molecules has the highest boiling point? CH 3CH 2OH CH 3OCH 3 CH 3CH 2CH 3 CH 3CHO Which of the following compounds contains both ionic and covalent bonds? NH 4Cl KCl CH 4 H 2 What is the dominant intermolecular force or bond that must be overcome in converting liquid CH 3OH to a gas - London dispersion force Hydrogen bonding Dipole-dipole interaction Covalent bonds Dipole-induced dipole interactions are present in which of the following pairs? H2O and alcohol Cl2 and CCl4 HCl and He atoms SiF4 and He atoms