question_answer

Which of the following reaction produce achiral product-

(I)

(II)

(III) \[C{{H}_{3}}-\overset{\overset{CHO}{\mathop{|}}\,}{\mathop{C}}\,=CH-\overset{\overset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{\underset{\underset{{{C}_{2}}{{H}_{5}}}{\mathop{|}}\,}{\mathop{C}}\,}}\,-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-H\xrightarrow{{{O}_{3}}/Zn/{{H}_{2}}O}\]

(IV) \[C{{H}_{3}}\equiv \underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-H\xrightarrow{HCN}\]

A) I, II, III, IV

B) I, III only

C) I, III, IV only     

D) I, II, III only

Correct Answer: B

Solution :

(II)

(III) \[C{{H}_{3}}-\overset{\overset{CHO}{\mathop{|}}\,}{\mathop{C}}\,=CH-\underset{\underset{{{C}_{2}}{{H}_{5}}}{\mathop{|}}\,}{\mathop{C}}\,-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-H\,\,\,Achiral\]

(IV) \[C{{H}_{3}}-\underset{\underset{H}{\mathop{|}}\,}{\mathop{\overset{\overset{OH}{\mathop{|}}\,}{\mathop{C}}\,}}\,-CN\,\,\,Chiral\]