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Question -

Among the isomeric alkanes of molecular formula C_5H_12, identify the one that on photochemical chlorination yields



Answer -

(i) Asingle monochloride.

(ii) Threeisomeric monochlorides.

(iii) Fourisomeric monochlorides.

Answer

(i) To have a single monochloride, there should be only onetype of H-atom in the isomer of the alkane of the molecular formula C5H12.This is because, replacement of any H-atom leads to the formation of the sameproduct. The isomer is neopentane.

Neopentane

(ii) To have three isomeric monochlorides, the isomer of thealkane of the molecular formula C5H12 shouldcontain three different types of H-atoms.

Therefore, the isomer is n-pentane.It can be observed that there are three types of H atoms labelled as ab and c in n-pentane.

(iii) To have four isomeric monochlorides, the isomer of thealkane of the molecular formula C5H12 shouldcontain four different types of H-atoms. Therefore, the isomer is2-methylbutane. It can be observed that there are four types of H-atomslabelled as abc, and d in2-methylbutane.

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