MCQ
Geometrical and optical isomerism exihibted by
- ✓$[Co(en)_2Cl_2]^+$
- B$[Co(NH_3)_5Cl]^{2+}$
- C$[Co(NH_3)_4Cl_2]^+$
- D$[Cr(OX)_3]^{3-}$

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$II.$ The ionization energy generally increases with increasing atomic number in a period.
$III.$ The electronegativity of an element is the tendency of an isolated atom to attract an electron.
Which of the above statements is/are correct?

$(I)$ Acid chloride $(II)$ Aldehyde
$(III)$ Ketone $(IV)$ Ester
Select the correct answer from the codes given below :
$(A)$ $CH _{3} COOH$
$(B)$ $HCHO$
$(C)$ $CH _{3} OOCH _{3}$
$(D)$ $CH _{3} CHO$
${C_6{H_5}N{H_2}}\xrightarrow{{{{(Ac)}_2}O}}$$X\xrightarrow{{B{r_2}/CC{l_4}}}Y\xrightarrow{{HOH}}Z$