National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-6

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Q: 22. An alkyl halide (X) on reaction with ethanolic sodium hydroxide forms an alkene (Y) which on further reaction with gives the same alkyl halide. The alkene (Y) on reaction with HBr/peroxide followed by reaction with Mg metal followed by reaction with HCN produces an aldehyde (Z). Z is:

(A)

Q 22 A Image of Alkyl halide

Q 22 a Image of Alkyl Halide

Q 22 A Image of Alkyl halide

(B)

Q 22 B Image of Alkyl halide

Q 22 B Image of Alkyl Halide

Q 22 B Image of Alkyl halide

(C)

Q 22 C Image of Alkyl halide

Q 22 C Image of Alkyl Halide

Q 22 C Image of Alkyl halide

(D)

Q 22 D Image of Alkyl halide

Q 22 D Image of Alkyl Halide

Q 22 D Image of Alkyl halide

Answer: (B & C)

Q: 23. is stronger acid than HCIO. The correct statement is;

(A) ion is more stabilized than

(B) ion has higher hydration energy than

(C) is better solvated in water than HCLO

(D) In H is attached to Cl, ahile in HCIO it is attached to O

Answer: (A)

Q: 24. For an elementary rearrangement reaction , the following data were recorded at 303 K, when

Q 24 Elementary Rearrangement Reaction Data for the Table

Q 24 Elementary Rearrangement Reaction Data for the Table

Q 24 Elementary Rearrangement Reaction Data for the Table

If the equilibrium constant of the reaction is 1.12 at 303 K, the rate constant for the reaction P→ A is

(A) 0.263

(B)

(C)

(D)

Answer: (A)

Q: 25. Compound P on treatment with (diazomethane) produces compound Q. Compound Q on reaction with Hl produces two alkyl iodides R and S. Alkyl iodide S with higher number of carbon atoms on reaction with KCN followed by hydrolysis gives 3.methylbutanoic acid. The compound P is

(A) 2-butanol

(B) 1-butanol

(C) 2-methyl-2-propanol

(D) 2-methyl-1-propanol

Answer: (D)

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