MCQ
Osmotic pressure of a solution can be measured quickly and accurately by
- ✓Berkeley and Hartley's method
- BMorse's method
- CPfeffer's method
- DDe Vries method
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$(I)$ $\phi -CH_3$
$(II)$ $\phi -CH_2-CH_3$
$(III)$ $\phi -CH(CH_3)_2$
$(IV)$ $\phi-C(CH_3)_3$
towards electrophilic substitution will be - [where $\phi =C_6H_5$]

