Only One Option Correct Type Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct. Q. The incorrect statement concerning E1 reaction is

polar protic solvent increases reactivit

reaction proceeds via carbocation intermediates

reaction proceeds via a single transition state

The correct statement regarding a unimolecular elimination reaction is

Rearrangement of carbon skeleton may occur during elimination reaction

If 14 C replaces α-carbon of substrate, reactivity remains unaltered

In the given condition of E1 reaction, no substitution reaction takes place

Consider the following reaction, Q. The correct statement concerning I and II is

I is the major product as it is formed at faster rate than II

II is the major product as it is formed at faster rate than I

I is major product as it is more stable than II

I and II are formed in comparable amounts

Consider the following elimination reaction, When reaction is carried out with C 2 H 5 ONain ethanol, 2-menthene is the major product while 3-menthene is the major product if reaction is substrate is heated in ethanol only. It is due to

with strong base, less substituted alkene is always the major product.

with strong base, reaction proceeds by E2 mechanism while with weak base, E1 reaction takes place.

methyl group gives steric hindrance to strong base in E2 reaction.

isopropyl group gives steric hindrance to strong base in E2 reaction.

The reaction of tertiary butyl chloride in water to yield tertiary butyl alcohol is not appreciably affected by dissolved NaF; in DMSO, however, NaF bring about rapid formation of isobutene. It is because of

in DMSO, reaction predominates over S N 1

E 2 reaction is preferred over S N 1 in DMSO

E2 reaction is preferred over S N 2 in DMSO

fluoride ion is not solvated by DMSO

When (CH 3 ) 3 C — Cl is heated in ethanol, both alkene and ether are formed simultaneously by E1 and S N 1 reaction. Which of the following will have adverse effect on both of the above reaction?

Presence of some water in ethanol

Consider the following reaction, Q. Increasing temperature increases the proportion of elimination (E1) product because

E1 product is enthalpy favoured

S N 1 product is entropy favoured

S N 1 product is enthalpy favoured

Comprehension Type Direction (Q. Nos. 12-14) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d). Passage Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism. Q. The correct statement concerning above elimination reaction is

when tertiary butyl group is trans, reaction occurs rapidly and deuterium is lost from β-carbon

when tertiary butyl group is trans, reaction occurs rapidly and hydrogen is lost from β-carbon

when tertiary butyl group is cis, reaction occurs rapidly and deuterium is lost from β-carbon

when tertiary butyl group is cis, reaction occurs rapidly and hydrogen is lost from β-carbon

Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism. Q. When tertiary butyl group and tosylate group are trans, the correct statement is

reaction occurs slowly and hydrogen is lost from β-carbon

reaction occurs slowly and both hydrogen and deuterium are lost from β-carbon

reaction occurs rapidly and hydrogen is lost from β-carbon

reaction occurs rapidly and deuterium is lost from β-carbon

Consider the following reaction. The tertiary butyl group can be cis or trans to tosylate group. Answer the following questions based on the knowledge of E2 and E1 reaction mechanism. Q. If the rate of reaction is independent of NaOEt concentration, it is concluded that

tertiary butyl group is cis to tosylate

tertiary butyl group is trans to tosylate

substitution reaction occur predominantly

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