Alkenes

In which of the following reactions is the initial step characterized by the attack of an electrophile on the organic reactant?

$CH3CH2Br+NaOH→CH3CH2OH+NaBr\text{CH}_3\text{CH}_2\text{Br} + \text{NaOH} \rightarrow \text{CH}_3\text{CH}_2\text{OH} + \text{NaBr}$

$CH3COCH3+HCN→(CH3)2C(OH)CN\text{CH}_3\text{COCH}_3 + \text{HCN} \rightarrow \text{(CH}_3)_2\text{C(OH)CN}$

$(CH3)2C=CH2+HBr→(CH3)3CBr\text{(CH}_3)_2\text{C}=\text{CH}_2 + \text{HBr} \rightarrow \text{(CH}_3)_3\text{CBr}$

$CH3CH3+Cl2→CH3CH2Cl+HCl\text{CH}_3\text{CH}_3 + \text{Cl}_2 \rightarrow \text{CH}_3\text{CH}_2\text{Cl} + \text{HCl}$

Alkenes Questions

In which of the following reactions is the initial step characterized by the attack of an electrophile on the organic reactant?

$CH3CH2Br+NaOH→CH3CH2OH+NaBr\text{CH}_3\text{CH}_2\text{Br} + \text{NaOH} \rightarrow \text{CH}_3\text{CH}_2\text{OH} + \text{NaBr}$

$CH3COCH3+HCN→(CH3)2C(OH)CN\text{CH}_3\text{COCH}_3 + \text{HCN} \rightarrow \text{(CH}_3)_2\text{C(OH)CN}$

$(CH3)2C=CH2+HBr→(CH3)3CBr\text{(CH}_3)_2\text{C}=\text{CH}_2 + \text{HBr} \rightarrow \text{(CH}_3)_3\text{CBr}$

$CH3CH3+Cl2→CH3CH2Cl+HCl\text{CH}_3\text{CH}_3 + \text{Cl}_2 \rightarrow \text{CH}_3\text{CH}_2\text{Cl} + \text{HCl}$