an alkyl halide, C6H13Cl reacts with potassium tertiary butoxide gives isomeric alkenes Y and Z. both alkenes give2,3- di methyl butane. identyfy y and z?

'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