(i) Arrange the following carbocation in increasing order of their stability.
(CH₃)₂ \(\overset { \oplus }{ CH } \) , CH₃CH₂⁺, (CH₃)₃C⁺ , \(\overset { + }{ { CH }_{ 3 } } \)
(ii) Write the IUPAC name of following compound.

0.25 g of an organic compound gave 38 cm³ of N₂ at 300 K and 96 k Pa pressure. Calculate % of Nin the sample.

What are electrophiles? Explain elecirophile substitution reaction with the help of example.

How will you detect the presence of nitrogen and sulphur in Lassaigne's extract?

Write all structural isomers of molecular formula C₃H₆O.

Give a brief description of the principles of the following techniques taking an example in each case: Distillation.

Identify the reagents shown in bold in the following equations as nucleophiles or electrophiles:
(a) CH₃COOH + HO^– → CH₃COO– +H₂O
(b) CH₃COCH₃+ \(\overset{-}CN\) → (CH₃)₂C(CN)(OH)
(c) C₆H₆ + CH₃\(\overset{+}CO\) → C₆H₅COCH₃

Consider structure I to VII and answer the following questions (i) and (ii).
I. \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ OH }\) 
II.
\({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad \quad { OH }\)  
III.
\({ \quad \quad \quad \quad CH }_{ 3 }\\ \quad \quad \quad \quad |\\ { { CH }_{ 3 } }-{ C }-{ CH }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { OH }\) 
IV.
\({ CH }_{ 3 }-{ CH }-{ CH_{ 2 } }-{ OH }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad { CH }_{ 3 }\) 
V. \({ CH }_{ 2 }-{ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 3 }\)
VI.
\({ CH }_{ 2 }-{ O }-{ CH }_{ 2 }-{ CH }_{ 2 }-{ CH }_{ 3 }\) 
VII.
\({ CH }_{ 3 }-{ O }-{ CH }-{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad \quad \quad { CH }_{ 3 }\) 
Identify the pairs of compounds that represent chain isomerism.