General Organic Chemistry & Isomerism · JEE Main previous year questions

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2009 5 questions

Q672009 · 27 Apr 2009 · Shift 1
The IUPAC name of neopentane is
1. A.2-methylbutane
2. B.2, 2-dimethylpropane
3. C.2-methylpropane
4. D.2,2-dimethylbutane
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Answer: B
Q682009 · 27 Apr 2009 · Shift 1
Arrange the carbanions, $(C H_{3})_{3} \overline{C}$ , $\overline{C} C l_{3}$ , $(C H_{3})_{2} \overline{C} H$ , $C_{6} H_{5} \overline{C} H_{2}$ in order of their decreasing stability :
1. A. $(C H_{3})_{2} \overline{C} H > \overline{C} C l_{3} > C_{6} H_{5} \overline{C} H_{2} > (C H_{3})_{3} \overline{C}$
2. B. $\overline{C} C l_{3} > C_{6} H_{5} \overline{C} H_{2} > (C H_{3})_{2} \overline{C} H > (C H_{3})_{3} \overline{C}$
3. C. $(C H_{3})_{3} \overline{C} > (C H_{3})_{2} \overline{C} H > C_{6} H_{5} \overline{C} H_{2} > \overline{C} C l_{3}$
4. D. $C_{6} H_{5} \overline{C} H_{2} > \overline{C} C l_{3} > (C H_{3})_{3} \overline{C} > (C H_{3})_{2} \overline{C} H$
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Answer: B
Q692009 · 27 Apr 2009 · Shift 1
The alkene that exhibits geometrical isomerism is :
1. A.propene
2. B.2-methyl propene
3. C.2-butene
4. D.2- methyl -2- butene
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Answer: C
Q782009 · 27 Apr 2009 · Shift 1
Which of the following has an optical isomer ?
1. A. $[Co (en) (N H_{3})_{2}]^{2 +}$
2. B. $[Co (H_{2} O)_{4} (en)]^{3 +}$
3. C. $[Co (en)_{2} (N H_{3})_{2}]^{3 +}$
4. D. $[Co (N H_{3})_{3} Cl]^{+}$
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Answer: C
Q792009 · 27 Apr 2009 · Shift 1
Which of the following pairs represents linkage isomers ?
1. A. $[Pd (PP h_{3})_{2} (NCS)_{2}]$ and $[Pd (PP h_{3})_{2} (SCN)_{2}]$
2. B. $[Co (N H_{3})_{5} N O_{3}] S O_{4}$ and $[Co (N H_{3})_{5} S O_{4}] N O_{3}$
3. C. $[PtC l_{2} (N H_{3})_{4}] B r_{2}$ and $[PtB r_{2} (N H_{3})_{4}] C l_{2}$
4. D. $[Cu (N H_{3})_{4}] [PtC l_{4}]$ and $[Pt (N H_{3})_{4}] [CuC l_{4}]$
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Answer: A