Serial No CHE302 Q2VIII 2018SU 0% H2 CH2 CH2 CH2+ B CH2B 2 Which of the followin

Question

Serial No CHE302 Q2VIII 2018SU 0% H2 CH2 CH2 CH2+ B CH2B 2 Which of the following is correct for E2 mechanism? (a) Proton and leaving group leave simultaneously. (c) Proton substitutes the leaving group. (b)Proton leaves first. (d) Leaving group leaves first. 3 Energy diagram of an SN2 reaction shown below represents three curves for three solvent types. Which of the following is correct about the type of solvent represented by curve# 1, 2 and 3 in the diagram? AG Reaction progress (a) 1 is polar protic, 2 is nonpolar and, 3 is polar aprotic. (b) 1 is polar protic, 2 is polar aprotic and, 3 is nonpolar. (c) 1 is nonpolar, 2 is polar aprotic and, 3 is polar protic. (d) 1 is polar aprotic, 2 is polar protic and, 3 is nonpolar. 4 Polar protic solvents tend to favor which reaction mechanisms? (a) Swl and SN2 (b) Sl and El (c) S2 and E2 (d) El and E2 5 Draw the products and label them as major or minor for the followin g reaction by E2 mechanism. Br

Explanation / Answer

1) b : will be the fastest SN1 reaction as t- butyl carbocation is stable.

2) a : In E2 elimination reaction the proton and leaving group leave symultaneously.

4 ) b : Polar protic solvent favours SN1 & E1 reactions.

5)The major product of the reactis is   (CH3)2C=CH-CH3 & Minor product is C2H5 (CH3).C=CH2

6) b: Strong base and t-alkyl halide favour E1 elimination reaction

7)SN2 reaction is fastest in reaction (a)

8) (c ): Doubling the concentration of the nucleophile the rate of the SN2 reaction will be doubled

9. (c) :Polar aprotic solvent is (CH3)2S=O

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