MCQ
How many $\sigma $ and $\pi$ bonds are present in $CH_3COOH$ ?
- A$1,7$
- B$5,2$
- ✓$7,1$
- D$3,2$

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$CO + \frac{1}{2}{O_2} \to C{O_2};\,\Delta H = Y$
Then the heat of formation of $CO$ is
Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals
Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.
In the light of the above statements, choose the correct answer from the options given below :