Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four…

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four, three, remains same, propane, $ns^{1-2}$, increases, six, propan-2-ol, $(n-1)d^{1-10}$, two, decreases, Clemmensen’s, Wolff-Kishner] Propanone on reaction with zinc amalgam in the presence of concentrated $\text{HCl}$ gives ____ and the reaction is called ____ reduction.