Free NEET Chemistry multiple-choice questions on Valence Bond Theory (VBT). Attempt each question and reveal the answer with a full explanation.
A (pi) bond is formed by the overlap of: Two p-orbitals sideways Two s-orbitals head-on s and p-orbital head-on Two p-orbitals head-on The correct order of C-H bond length in Ethane ( C 2H 6 ), Ethene ( C 2H 4 ) and Ethyne ( C 2H 2 ) is: C 2H 6 > C 2H 4 > C 2H 2 C 2H 2 > C 2H 4 > C 2H 6 C 2H 6 > C 2H 2 > C 2H 4 C 2H 4 > C 2H 6 > C 2H 2 The crown-shaped structure of the S 8 molecule is due to the sulfur atoms having: sp 3 hybridization sp 2 hybridization sp hybridization No hybridization The percentage of s-character in the central atom of BF 3 is: 33.3% 25% 50% 66.6% The hybridization of the Phosphorus atom in POCl 3 is: sp 3 sp 2 sp 3d dsp 2 BF 3 is a planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively, are: sp 2 and 6 sp 3 and 4 sp 3 and 6 sp 2 and 8 The bond angle in the ammonium ion ( NH 4 + ) is: 109.5 107 104.5 120 Nitrogen cannot form NCl 5 because: It lacks vacant d -orbitals in its valence shell It is highly electronegative The N-Cl bond is too weak Nitrogen is too small to accommodate 5 Chlorine atoms The hybridization of Carbon in CO 2 is: sp sp 2 sp 3 None of these In the gaseous phase, the hybridization of Beryllium in BeCl 2 monomer and the shape of the molecule are: sp , Linear sp 2 , Trigonal planar sp 3 , Tetrahedral dsp 2 , Square planar In the formation of a (pi) bond, the atomic orbitals overlap in a: Sideways (lateral) manner Head-on (axial) manner Circular manner None of these The five sp 3d hybrid orbitals are oriented in space towards the corners of a: Trigonal bipyramid Square pyramid Pentagon Octahedron What is the hybridization of the Oxygen atom in the H 3O + ion? sp 3 sp 2 sp dsp 2 The correct order regarding the electronegativity of hybrid orbitals of carbon is:- sp > sp 2 < sp 3 sp > sp 2 > sp 3 sp < sp 2 > sp 3 sp < sp 2 < sp 3 Which of the following organic compounds has same hybridization as its combustion product ( CO2 )? Ethane Ethyne Ethene Ethanol Which of the following molecules represents the order of hybridisation sp 2 , sp 2 , sp , sp from left to right atoms? CH2=CH-CH=CH2 CH2=CH-C CH HC C-C CH CH3-CH=CH-CH3 The hybridization of the central iodine atom in the triiodide ion ( I 3 - ) is: sp 3d sp 3 sp 2 sp 3d 2 The hybridization of Xenon in XeOF 4 is: sp 3d 2 sp 3d sp 3 d 2sp 3 The species in which the central atom uses sp 2 hybrid orbitals for its bonding is: SO 2 SO 3 2- NH 3 PCl 3 The C-C bond length is maximum in: Diamond Graphite Benzene Fullerene Which of the following d -orbitals is involved in sp 3d hybridization to form a trigonal bipyramidal geometry? d z 2 d x 2-y 2 d xy d xz Which of the following sets of d -orbitals are involved in sp 3d 2 hybridization of the central atom in an octahedral complex? d x 2-y 2 and d z 2 d xy and d z 2 d x 2-y 2 and d xy d xz and d yz A (sigma) bond is formed by the: Head-on overlap of atomic orbitals Sideways overlap of atomic orbitals Overlap of two p-orbitals only Overlap of two s-orbitals only The hybridization and molecular shape of the IF 5 molecule are: sp 3d 2 and Square pyramidal sp 3d 3 and Pentagonal bipyramidal sp 3d and Trigonal bipyramidal sp 3d 2 and Octahedral The hybridization of the central and terminal carbon atoms in carbon suboxide ( C 3O 2 ) are respectively: sp, sp sp, sp 2 sp 2, sp sp 2, sp 2 The total number of bonds in the P 4 molecule is: 6 4 12 3 In the sp 3d hybridization of a central atom to form a trigonal bipyramidal molecule, which d -orbital is involved? d z 2 d x 2-y 2 d xy d yz In the vapor state above 1200 K , BeCl 2 exists as a: Monomer with sp hybridization Dimer with sp 2 hybridization Polymer with sp 3 hybridization Monomer with sp 2 hybridization The hybridization of Sulfur in H 2SO 4 and the formal charge on Sulfur (assuming the structure with two S=O bonds) are: sp 3, 0 sp 3, +2 sp 2, 0 sp 3d 2, 0 Identify the type of overlap that results in the formation of a (pi) bond when the x -axis is the internuclear axis. p y - p y overlap p x - p x overlap s - p x overlap d z 2 - d z 2 overlap The hybridization of the central Iodine atom in the ICl 2 + ion is: sp 3 sp 2 sp 3d sp The p - d bonding is present in which of the following? ClO 4 - CO 3 2- NO 3 - BO 3 3- The hybridization of the central carbon and the two terminal carbons in Propadiene (Allene, CH 2=C=CH 2 ) are respectively: sp, sp 2 sp 2, sp sp 2, sp 2 sp, sp 3 Which species contains both and bonds? CN - NH 4 + CH 4 H 2O Which statement about the bonding in Carbon Monoxide ( CO ) is correct? It contains two bonds and one bond It contains one bond and two bonds, one of which is a coordinate bond It is a purely ionic compound The bond order is 2 The total number of bonds in a molecule of phosphorus trioxide ( P 4O 6 ) is: 12 6 8 10 In sp 3d 2 hybridization, the atomic orbitals involved are: s, p x, p y, p z, d x 2-y 2 , d z 2 s, p x, p y, p z, d xy , d z 2 s, p x, p y, p z, d xy , d yz s, p x, p y, p z, d xz , d yz Boron trichloride ( BCl 3 ) is a planar molecule, while Aluminum trichloride ( AlCl 3 ) exists as a dimer ( Al 2Cl 6 ). This difference is because: Al can expand its octet using d-orbitals while B cannot Al is more electronegative than B B is larger than Al BCl3 has back-bonding while AlCl3 does not Which of the following contains a dπ-pπ bond? SO 3 CO 3 2- NO 3 - BO 3 3- Consider the x -axis as the internuclear axis. Which of the following atomic orbital overlaps will result in the formation of a (pi) bond? 2p y + 2p y 1s + 2p x 2p x + 2p x 2s + 2p x The hybridization of the carbon atoms in acetonitrile ( CH 3CN ), starting from the methyl carbon to the nitrile carbon, are: sp 3, sp sp 3, sp 2 sp 2, sp sp, sp 3 The state of hybridization of the central Phosphorus atom in the PCl 6 - ion is: sp 3d 2 sp 3d d 2sp 3 sp 3 The hybridizations of atomic orbitals of nitrogen in NO 2 + , NO 3 - and NH 4 + respectively are: sp, sp 2, sp 3 sp, sp 3, sp 2 sp 2, sp, sp 3 sp 2, sp 3, sp The state of hybridization of C2 , C3 , C5 and C6 of the hydrocarbon – is in the following sequence : sp, sp 2, sp 3 and sp 2 sp, sp 3, sp 2 and sp 3 sp 3, sp 2, sp 2 and sp sp, sp 2, sp 2 and sp 3 The hybridization of Carbon atoms in Diamond and Graphite are respectively: sp 3 and sp 2 sp 2 and sp 3 sp 3 and sp sp 2 and sp Which of the following has p π- d π bonding? SO 3 2- NO 3 - CO 3 2- BO 3 3- In which of the following molecules are all the C-H bonds not in the same plane? Allene ( CH 2=C=CH 2 ) Ethene ( C 2H 4 ) Benzene ( C 6H 6 ) 1,3-Butadiene The percentage of s-character in the hybrid orbitals of nitrogen in NO 2 + , NO 2 - and NO 3 - follows the order: NO 2 + > NO 3 - > NO 2 - NO 2 + > NO 2 - > NO 3 - NO 3 - > NO 2 + > NO 2 - NO 2 - > NO 3 - > NO 2 + The total number of bonds in a molecule of phosphorus pentoxide ( P 4O 10 ) is: 16 12 10 20 The specific d -orbital involved in dsp 2 hybridization for the formation of a square planar complex is: d x 2-y 2 d z 2 d xy d xz The molecule trisilylamine, (SiH 3) 3N , is planar, whereas trimethylamine, (CH 3) 3N , is pyramidal. This difference is due to: p -d back-bonding in (SiH 3) 3N p -p back-bonding in (SiH 3) 3N Steric hindrance in (CH 3) 3N Higher electronegativity of Silicon In the ClO 2 molecule, the central Chlorine atom undergoes which hybridization? sp 2 sp 3 sp dsp 2 Which of the following represents a 'delta' ( δ ) bond? Overlap of four lobes of d -orbitals Head-on overlap of d -orbitals Sideways overlap of d -orbitals Overlap of s and d -orbitals Trisilylamine (SiH 3) 3N is planar because of: p - d back-bonding between N and Si p - p bonding between N and Si Steric hindrance of the SiH 3 groups sp 3 hybridization of Nitrogen In the OF 2 molecule, the bond length of O-F is 1.41 . In O 2F 2 , the O-F bond length is 1.58 . This increase in bond length in O 2F 2 is due to: Decrease in the s-character of Oxygen in O 2F 2 Increase in s-character of Oxygen in O 2F 2 Stronger electronegativity of Oxygen Resonance stabilization The state of hybridization of the sulfur atom in SO 2 is: sp 2 sp 3 sp sp 3d Which of the following molecules follows Drago's Rule and thus shows almost no hybridization of the central atom? PH 3 NH 3 BF 3 CH 4 Which of the following overlap of atomic orbitals (assuming z is the internuclear axis) will result in a zero overlap? d xy and p z p x and p x s and p z d z 2 and s The p -p back bonding is most significant in which of the following? BF 3 BCl 3 BBr 3 BI 3 The hybridization and shape of the XeOF 2 molecule are: sp 3d , T-shaped sp 3d , Trigonal planar sp 3d 2 , Square planar sp 3 , Pyramidal The bonding in an Oxygen molecule ( O 2 ) consists of: One σ bond and one π bond Two σ bonds and zero π bonds Zero σ bonds and two π bonds One σ bond and two π bonds The hybridization and shape of the IF 7 molecule are: sp 3d 3 , Pentagonal bipyramidal sp 3d 2 , Octahedral sp 3d 3 , Capped octahedral sp 3d , Trigonal bipyramidal When BF 3 reacts with NH 3 to form the adduct F 3B NH 3 , the hybridization of the Boron atom changes from: sp 2 to sp 3 sp 3 to sp 2 sp 2 to sp Remains sp 2