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.

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

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

Write all structural isomers of molecular formula C₃H₆O.

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

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

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.

(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.