14 past paper MCQs on Hybridization, from the Chemical Bonding unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.
1.In which of the following functional groups is the carbon atom $sp$ hybridized? (MDCAT 2022)
Correct answer: (c) $-\mathrm{CN}$
The carbon of the nitrile group holds a triple bond, so it is $sp$ hybridized and linear.
2.Correct arrangement of orbital according to size of hybridized orbitals? (UHS MDCAT 2025)
Correct answer: (d) sp3>sp2>sp
More s character pulls the orbital in, so the sp orbital is the smallest and sp3 the largest.
3.In ethene molecule, each carbon atom has three hybridized sp2 orbitals which are: (KMU MDCAT 2025)
Correct answer: (a) Coplanar
Three sp2 orbitals lie in one plane at $120^{\circ}$ to each other.
4.In which of the following molecules does the central atom use sp2 hybridization? (KMU MDCAT 2025)
Correct answer: (c) BH3
Boron in $\mathrm{BH_3}$ has three bond pairs and no lone pair, so it is sp2 and trigonal planar.
5.The unhybridized p orbital in sp2 hybridization is (KMU MDCAT 2024)
Correct answer: (d) Perpendicular to sp2 orbitals
The three sp2 orbitals lie in a plane and the leftover p orbital stands at right angles to it.
6.Carbon atoms in ethane are hybridized: (SZABMU MDCAT 2023)
Correct answer: (a) Sp3
Each carbon of ethane has four sigma bonds, so it is sp3.
7.In alkanes, each Carbon has hybridization: (SZABMU MDCAT 2023)
Correct answer: (a) Sp3
Every carbon of an alkane makes four sigma bonds, so all are sp3.
8.Which of the following has sp3 hybridization? (NUMS MDCAT 2023)
Correct answer: (d) CH4
Carbon in methane has four sigma bonds and no lone pair, so it is sp3.
9.How many hybrdized orbitals are formed by intermixing of 4 atomic orbitals? (PMC MDCAT 2022)
Correct answer: (b) 4
Hybridization gives back as many orbitals as it mixes, so four atomic orbitals give four hybrids.
10.In the structure of diamond, each carbon atom is ____ hybridized? (PMC MDCAT 2022)
Correct answer: (a) sp3
Each carbon in diamond is bonded tetrahedrally to four others, so it is sp3.
11.Sp3 hybridization is also called as: (PMC MDCAT 2022)
Correct answer: (a) Sigma
All four sp3 orbitals overlap head-on, so every bond they make is a sigma bond.
12.Type of hybridization of carbon in Ethene (H2C=CH2) is: (NUMS MDCAT 2022)
Correct answer: (b) sp2
Each carbon of ethene makes three sigma bonds and one pi bond, so it is sp2.
13.Which of the following hybrid orbitals has maximum “s” character? (PMC MDCAT 2020)
Correct answer: (c) Sp hybrid orbital
An sp orbital is half s character, more than sp2 or sp3.
14.Which one of the following molecules has sp3 hybridization? (UHS MDCAT 2019)
Correct answer: (a) CH4
Carbon in methane has four sigma bonds and no lone pair.