Which of the following is Clemmensen reduction?

Write about the boiling points of aldehydes and ketones.

What is the product formed when propanal reacts with dilute sodium hydroxide?

$A$ tertiary alcohol $H$ upon acid-catalysed dehydration gives a product $I$. Ozonolysis of $I$ leads to compounds $J$ and $K$. Compound $J$ upon reaction with $KOH$ gives benzyl alcohol and a compound $L$,whereas $K$ on reaction with $KOH$ gives only $M$.
$1.$ Compound $H$ is formed by the reaction of
$2.$ The structure of compound $I$ is
$3.$ The structures of compounds $J, K$ and $L$,respectively,are
$(A)$ $PhCOCH_3, PhCH_2 COCH_3$ and $PhCH_2 COO^{-} K^{+}$
$(B)$ $PhCHO, PhCH_2 CHO$ and $PhCOO^{-} K^{+}$
$(C)$ $PhCOCH_3, PhCH_2 CHO$ and $CH_3 COO^{-} K^{+}$
$(D)$ $PhCHO, PhCOCH_3$ and $PhCOO^{-} K^{+}$
Give the answer for questions $1, 2$ and $3.$

$HOCH_2-C(=O)-CH(OH)-CH_2OH \xrightarrow{HIO_4}$ Product obtained is:

$CH_3-CH(OH)-CH_3 \xrightarrow{Cu/300^\circ C} \text{Product (X)}$. Which of the following is correct about product $X$?