Please tell me if C-I bond undergoes homolytic cleavage or heterolytic cleavage ..... I am confused because both have similar electronegativity but alkenes are formed by alkyl iodide very fastly... Please explain......

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane