$$ \text { The correct IUPAC name of the following compound is : } $$

3-ethyl-5-methylheptane
2,4-diethylhexane
3-methyl-5-ethylheptane
3,5-diethylhexane
A bulb is rated at 150 watt, converting $8 \%$ energy into light. If energy of one photon is $4.42 \times 10^{-19} \mathrm{~J}$, how many photons are emitted by the bulb per second?
$2.71 \times 10^{19}$
$4.06 \times 10^{19}$
$27.2 \times 10^{19}$
$1.35 \times 10^{19}$
Methane reacts with steam at 1273 K in the presence of nickel catalyst to form :
CO and $\mathrm{H}_2 \mathrm{O}$
$ \mathrm{CO}_2$ and $\mathrm{H}_2$
$ \mathrm{CO}$ and $\mathrm{H}_2$
$ \mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$
Compound $\mathrm{P}\left(\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}\right)$ gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, $P$ gives an aromatic product $Q$ that produces effervescence on treating with aq. $\mathrm{NaHCO}_3$. Compounds P and Q , respectively, are :




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