Question

a) which of the following two compounds would react faster by SN2 pathway .

1- bromobutane and 2- Bromobutane and why?

b)allyl chloride is more reactive than n-propyl chloride towards nucleophilic substitution reaction ?

c) haloalkenes react with KCN to give alkyl cyanide as main product , whereas AgCN form isocyanide as main product.

Answer 1

(a) 1-bromobutane shows SN2 reaction faster because it for primary carbocation and the reactivity order for SN2 is 1°>2°>3°.
(b) allyl chloride is more reactibe because it form stable carbocation which is resonance stabilized so it is more reactive than n propyl towards nucleophilic reaction.
(c) because KCN is ionic and it give cyanide anion which attach on carbon and C-C bond is more stable than C-N so it form alkyl cyanide but AgCN is covalent and N has lone pair to donate soo it form alkyl isocyanide.
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Answer 2

Answer:

1 – bromobutane

Explanation:

Because SN² mechanism is faster for primary carbonation as compared to secondary and tertiary carbonation.

Reactivity order for SN² mechanism is:-

1°>2°>3°.