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Only One Option Correct Type
Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q.
What is the major alkene product in the following reaction?
Which of the following gives 1-butene as the major product most easily on heating with AgOH?
1-butene would be formed most easily in the following reaction when X is
Rate of reaction in E2 reaction depends on acidity of β—H as well as steric hindrance at β-carbon. When X is F, acidity is maximum and there is less steric hindrance at less substituted β-carbon.
Which of the following compound is most likely to follow E1 cb mechanism when treated with C2H5ONa in ethanol?
It forms resonance stabilised carbanion after abstraction of β—H hence, favours the most to E1cb mechanism.
Consider the following reaction and the product formed.
The most likely mechanism of the above reaction is
Above equilibrium can explain the formation of given product, hence reaction must proceed by E1 cb mechanism
Matching List Type
Direction (Q. Nos. 6 and 7) Choices for the correct combination o f elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Match the reaction from Column I with the type of m echanism from Column II and mark the correct option from the codes given below.
(i) Given halide is a primary, predominantly undergo SN2 reaction.(ii) Given halide is secondary, can undergo SN2 reaction. Also, E2 reaction leads to a conjugated system. Also it may react by E1 cb mechanism because it forms resonance stabilised carbanion.(iii) It is a 3° halide and in the presence of weak base H2O, weak nucleophile H2O , it may undergo unimolecular substitution (SN1) and elimination (E1) reaction.(iv) It may form a stable benzylic carbocation after hydride shift, hence may react by SN1 mechanism. Also it is a secondary halide, may undergo SN2 reaction. It may also react by E2 reaction ai it gives conjugated system. Carbanion. formed at β-C will be stabilised by resonance from ring, hence may undergo E1 cb mechanism.
Match the alkyl halides in the Column I with the properties of their products produced in E2 elimination reaction in Column II and mark the correct option from the codes given below.
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