1.

A hydrocarbon of molecular mass 72 g mol^(-1) gives a single monochloro derivative and two dichloro derivatives on photo chlorination. Give the structure of the hydrocarbon.

Answer»

Solution :`C_(5)H_(12)`, Pentane has MOLECULAR mass 72 g `MOL^(-1)`. Neo-pentane YIELD monochlorinated product because all 1,2-hydrogen are equivalent.
`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-CH_(3) overset(Cl_(2))underset(" Light ")rarr CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-CH_(2)Cl`
Dichloro derivatives :
`underset((i))(CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-CHCl_(2))`
`CH_(3)-overset(CH_(2)-Cl"")overset("|")underset(CH_(2)-Cl" ")underset("|")(C-CH_(3))`


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