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Q.

Read the passage given below and answer the following questions:
Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN²) and substitution nucleophilic unimolecular (SN¹) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN¹ and SN² reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN² reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN¹ reactions.
Which of the following would undergo SN² reaction faster?

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a

${CH}_{3} {CH}_{2} {CH}_{2} F$

b

${CH}_{3} {CH}_{2} {CH}_{2} I$

c

${CH}_{3} {CH}_{2} {CH}_{2} Cl$

d

${CH}_{3} {CH}_{2} {CH}_{2} Br$

answer is B.

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Detailed Solution

primary alkyl halides undergoes S_N2 reactions faster

Iodide ion is better leaving group readily undergoes S_N2 reaction

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Read the passage given below and answer the following questions:Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN2) and substitution nucleophilic unimolecular (SN1) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN1 and SN2 reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN2 reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN1 reactions.Which of the following would undergo SN2 reaction faster?