What is not a right explanation for the reaction occur? Energy provided, which i

Question

What is not a right explanation for the reaction occur? Energy provided, which is higher than activation energy b) No collision between the reactants molecules c) Good stirring for the reactants d) High energy provided for fast reaction What is not a right explanation for the Arrhenius equation k_r = Ae^- a) k: rate constant b) A: Activation energy c) R: Gas constant d) T: temperature in Kelvin Which is a wrong propagation step for monochlorination of Ethane? a) CH_3CH_3 + Cl radical b) CH_3CH_3 + CH_3CH_2 radical c) Cl_2 + H radical d) Cl_2 + CH_3CH_2 radical Which reactive intermediate is the most stable one? a) ^+CH_2CH_3 b) ^+CH_3 c) ^+CH(CH_3)_2 d) ^+C(CH_3)_3 There is a mixture of two enantiomers of 2-bromohexane. the percent between two isomers are 40% of (R) and 60% of (S) isomers. What is the ee mixture? a) 40% b) 60 % c) 100 % d) 20% Which solvent is the best one for SN_2 reaction in general? a) Ethanol b) Acetone c) Acetic acid d) water What would be the difference between two reactions, free radical chain nucleophilic substitution reactions? a) Free radical reaction is a stepwise reaction and SN is a concerted reaction. b) Free radical reaction is a non-polar reaction and SN is a polar reaction. c) Free radical reaction requires no solvent, but SN does. d) Free radical reaction needs heat only, but SN needs light only. Which statement is correct? a) A racemic mixture shows the optical activity. b) A mesa isomer shows the optical activity. c) A mixture of two diastereomers has no optical activity. d) A mixture of two enantiomers shows no optical activity. Which statement is correct for the SN reaction? a) SN_1 reaction is based on one step process. b) SN_2 reaction includes one molecule In the rds. c) Solvolysis is a SN_1 reaction. d) Walden inversion is observed in SN_1 reaction. Which structure shows (R) configuration?

Explanation / Answer

1. C) Good stirring of reactants

reaction between substances depends on their nature and the rate of reaction depends on energy barrier of the reaction, thus the stirring would not effect the reaction

2. B) A = Arhenius constant

In Arhenius equation, A stands for Arhenius constant and Ea represents activation energy

3. C) H + Cl2 reaction will not occur in the chlorination of ethane

Mechanism: Cl2 + light ----> 2Cl.(initiation)

Cl. + CH3-CH3 -----> CH3-CH2. + HCl (propagation)

CH3CH2. + Cl2 ----> CH3CH2Cl + Cl.

CH3-CH2. + CH3CH2. ----> CH3-CH2-CH2-CH3 (TERMINATION)

CH3CH2. + Cl ----> CH3CH2Cl

4. D) Tertiary butyl radical((CH3)3-C.) is more stable

The order of stability of freeradicals is tertiary>secondary>primary>methyl. This stability order can be explained using hyperconjugation

5. D) ee = 20%

ee can be calculated using the formula, ee= ((R-S)/(R+S))*100

6. B) Acetone

Generally, polar protic solvents favors SN1 and polar aprotic solvents favors SN2

7. B) free radical reaction is nonpolar reaction while SN is a polar reaction

Free radical reaction occurs in nonpolar molecules like alkanes, alkenes etc, while SN occurs in polar molecules like alkylhalides, alcohols etc.,

8. C) A mixture of two diastereomers has no optical activity

In general, a mixture of two diastereomers shows optical activity

9. C) Solvolysis is SN1 reaction

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