In which of the following reactions, hydrogen is evolved?
I. Reaction of sodium borohydride with iodine
II. Oxidation of diborane
III. Reaction of boron trifluoride with sodium hydride
IV. Hydrolysis of diborane
Which of the following statements is not correct regarding the gas evolved by the reaction of dilute HCl on $\mathrm{CaCO}_3$ ?
Observe the following statements
Statement I The carbon containing components of photochemical smog are acrolein, methanal and PAN. Statement II The number of greenhouse gases in the list given below is 5 .
$$ \mathrm{CH}_4, \mathrm{CO}_2, \mathrm{NO}, \mathrm{H}_2 \mathrm{O}(l), \mathrm{H}_2 \mathrm{O}(g), \mathrm{O}_2, \mathrm{O}_3 $$
The correct answer is
The condensed, bond line and complete formulae of $n$-butane are respectively.

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