Question

Match the structures of compounds given in Column I with the classes of compounds given in Column II.

	Column I	Column II
(i)	\[\begin{array}{cc} \ce{CH3 - CH - CH3}\\ |\phantom{..}\\ \ce{X}\phantom{..} \end{array}\]	(a) Aryl halide
(ii)	\[\ce{CH2 = CH - CH2 - X}\]	(b) Alkyl halide
(iii)		(c) Vinyl halide
(iv)	\[\ce{CH2 = CH - X}\]	(d) Allyl halide

Answer 1

	Column I	Column II
(i)	\[\begin{array}{cc} \ce{CH3 - CH - CH3}\\ |\phantom{..}\\ \ce{X}\phantom{..} \end{array}\]	(b) Alkyl halide
(ii)	\[\ce{CH2 = CH - CH2 - X}\]	(d) Allyl halide
(iii)		(a) Aryl halide
(iv)	\[\ce{CH2 = CH - X}\]	(c) Vinyl halide

Explanation:

(i) In alkyl halide, the halogen atom is bonded to sp³ hybridised carbon atom, which may be further bonded to one, two or three alkyl groups, i.e., \[\begin{array}{cc}
\ce{CH3 - CH - CH3}\\
|\phantom{..}\\
\ce{X}\phantom{..}
\end{array}\]

(ii) Allyl halides are the compounds in which the halogen atom is bonded to sp³ hybridised carbon atom next to the carbon-carbon double bond, i.e., \[\ce{CH2 = CH - CH2 - X}\]

(iii) Aryl halides are the compounds in which the halogen atom is bonded to the sp² hybridised carbon atom of an aromatic ring, i.e., \[\ce{C6H5X}\]

(iv) Vinyl halides are the compounds in which the halogen atom is bonded to an sp² hybridised carbon atom of a carbon-carbon double bond, i.e., \[\ce{CH2 = CH-X}\]