Which is the wrong statement?

CHEMISTRY · Single correct · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties

Problem

Which is the wrong statement? (1) The decreasing order of thermal stability is CsOH>RbOH>KOH>NaOH\text{CsOH}>\text{RbOH}>\text{KOH}>\text{NaOH}. (2) The decreasing order of bond angle is BF3>PF3>ClF3\text{BF}_3>\text{PF}_3>\text{ClF}_3. (3) The decreasing order of bond dissociation energy is Cl2>Br2>F2>I2\text{Cl}_2>\text{Br}_2>\text{F}_2>\text{I}_2. (4) The decreasing order of melting point is NH3>(CH3)2NH>CH3NH2>(CH3)3N\text{NH}_3>(\text{CH}_3)_2\text{NH}>\text{CH}_3\text{NH}_2>(\text{CH}_3)_3\text{N}.

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