alleryIn benzene C₆H₆, each C is:
- sp³
- sp³d
- sp²
- sp
Show answer and solution
Correct answer: C. sp²
Each carbon in benzene forms 3 σ bonds (to 2 C and 1 H) + 1 π in delocalized system.
So 3 hybrid orbitals → sp².
Bond angle 120°, planar.
JEE Main Chemical Reactions and Equations — practice questions — page 2
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In benzene C₆H₆, each C is:Read the answer and worked solution →Number of π bonds in HCN:Read the answer and worked solution →According to VSEPR theory, the shape of a molecule is determined byRead the answer and worked solution →The hybridisation of carbon in methane (CH₄) isRead the answer and worked solution →Which molecule is non-polar despite having polar bonds?Read the answer and worked solution →The bond order of the oxygen molecule O₂ (by molecular orbital theory) isRead the answer and worked solution →A coordinate (dative) bond differs from a normal covalent bond in thatRead the answer and worked solution →Which species has sp hybridisation on the central atom?Read the answer and worked solution →As bond order increases, bond lengthRead the answer and worked solution →An ionic bond forms byRead the answer and worked solution →The shape of NH₃ is pyramidal rather than planar becauseRead the answer and worked solution →Which has the highest dipole moment?Read the answer and worked solution →Among the following, which is paramagnetic?Read the answer and worked solution →Formal charge on an atom =Read the answer and worked solution →Match each reaction type to an example.Read the answer and worked solution →Balance the combustion of methane.Read the answer and worked solution →Balance magnesium burning in oxygen.Read the answer and worked solution →
Worked practice questions
Number of π bonds in HCN:
- 1
- 2 (in C≡N triple bond)
- 3
- 0
Show answer and solution
Correct answer: B. 2 (in C≡N triple bond)
**HCN:** H-C≡N. The C≡N triple bond is 1 σ + 2 π.
The H-C is single (σ only).
**So total π bonds = 2.**
According to VSEPR theory, the shape of a molecule is determined by
- the colour of the element
- temperature
- repulsion between electron pairs around the central atom
- the atomic mass
Show answer and solution
Correct answer: C. repulsion between electron pairs around the central atom
VSEPR: electron pairs (bonding + lone) arrange to minimise repulsion, fixing the molecular geometry.
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