Worksheets › Class 11 › Organic Chemistry – Some Basic Principles and Techniques
Class 11 Organic Chemistry – Some Basic Principles and Techniques worksheet
CBSE Chemistry. IUPAC names, isomerism, electronic effects, intermediates, estimation of elements. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The ability of carbon to form long chains by bonding to itself is called:
- isomerism
- resonance
- hybridisation
- catenation
Answer
(d) catenation
- 2.
The IUPAC name of CH₂=CHCH₃ is:
- 2-methylpropene
- propan-1-amine
- propene
- 2-methylpropan-1-ol
Answer
(c) propene
longest chain, lowest locants, functional group as suffix
- 3.
CH₃CH₂CHO belongs to the class:
- ether
- alkane
- ketone
- aldehyde
Answer
(d) aldehyde
look at the functional group
Section B · short answer
- 4.
What is the difference between homolytic and heterolytic cleavage?
Answer
In homolytic cleavage each atom keeps one electron of the bond, giving free radicals. In heterolytic cleavage one atom takes both electrons, giving a cation and an anion (for carbon, a carbocation or a carbanion).
- 5.
3 g of an organic compound gave 6.6 g of CO₂ and 3.6 g of H₂O on complete combustion. Find the percentages of carbon and hydrogen in it. (2 decimal places where needed.)
Answer
C 60%; H 13.33% (it is propan-1-ol)
%C = 12 × mass CO₂ × 100/(44 × mass); %H = 2 × mass H₂O × 100/(18 × mass)
Section C · long answer
- 6.
Explain the inductive effect, resonance effect, electromeric effect and hyperconjugation, with one example each.
Answer
Inductive: permanent σ-electron shift towards an electronegative atom; in CH₃CH₂Cl, chlorine pulls electrons from carbon. Resonance: delocalisation of π electrons or lone pairs through conjugation; in phenol the O lone pair spreads into the ring (+R). Electromeric: temporary complete π-electron shift when a reagent attacks a C=C or C=O. Hyperconjugation: delocalisation of C–H σ electrons into an adjacent empty p orbital or π bond; it makes (CH₃)₃C⁺ more stable than CH₃⁺.
Fresh sheets for your child
In the app, every Organic Chemistry – Some Basic Principles and Techniques sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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