Nitration of Alkanes

Q. How many carbonyl isomers of C5H10O which react with PhMgBr to give racemic mixture?(5)

Q.

The idea of nascent hydrogen is considered unnecessary. How will u justify the statement

Q. Complete the following reaction:
$C_2{H}_6+\mathrm{conc}.{\mathrm{HNO}}_3\stackrel{400°C}{\to }$ $+H_{2}O$

1. $2{\mathrm{CH}}_3{\mathrm{NO}}_2$
2. $C_2{H}_5{\mathrm{NO}}_2$
3. $C_2{H}_5\mathrm{ONO}$

Q. Complete the following reaction:
$C_2{H}_6+\mathrm{conc}.{\mathrm{HNO}}_3\stackrel{400°C}{\to }$ $+H_{2}O$

1. $2{\mathrm{CH}}_3{\mathrm{NO}}_2$
2. $C_2{H}_5{\mathrm{NO}}_2$
3. $C_2{H}_5\mathrm{ONO}$