Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following compounds contain chiral carbon atom? (1) 2-chloropentane (2) 1-chloro-2-methylpentane (3) 3-chloro-2-methylpentane (4) 1-chloropentaneA) 1, 2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: A
Solution :
The compound in which all the four valencies of carbon are attached to four different groups, is chiral. (1) \[\underset{2-chloropentane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}\underset{*}{\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{CH}}}\,-C{{H}_{3}}}}\,\] (2) \[\underset{1\text{ }-chloro-2-methylpentane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}\underset{*}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{CH}}}\,-C{{H}_{2}}Cl}}\,\] (3) \[\underset{3-chloro-2-methyl\text{ }pentane}{\mathop{C{{H}_{3}}C{{H}_{2}}\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{^{*}C}}}\,-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}}}\,\] (4) \[\underset{1-chloropentane}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}Cl}}\,\] where, \[\overset{*}{\mathop{C}}\,=\]chiral carbon atom
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