MCQ
has the $IUPAC$ name


- A$1 -$ Ethyl $-3, 3 -$ dimethyl cyclohexane
- B$3 -$ Ethyl $-1, 3 -$ dimethyl cyclohexane
- ✓$3 -$ Ethyl $-1, 1 -$ dimethyl cyclohexane
- D$3, 3 -$ Dimethyl $-1 -$ ethyl cyclohexane

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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 :
