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Q.

Identify the correct statements among the Following

A) m.pt order: p-dichlorobenzene > o-dichloro benzene

B) B.pt : order: o-dichlorobenzene >p-dichloro benzene

C) Reactivity order for nucleophilic substitution:

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a

only A 

b

only B

c

A&B only     

d

A,B,C

 

answer is D.

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Detailed Solution

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Molecular packing is the main criteria for determining melting point order. P -Dichlorobenzene is symmetrical and easily fits into a crystal lattice

The boiling point of ortho dichlorobenzene is greater than the boiling point of meta and para dichlorobenzene due to its greater polar nature . The boiling point order is ortho > meta > para dichlorobenzene

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