79.

80,

81,

82,

83,

84,

85,

86,

87.

Choose the correct statement(s) about [18]-Annulene.
(^) [18]-Annulene is non-aromatic due to the non-planar structure

(B) All the hydrogens are in the same environment as indicated by a singlet at
3 (9.25 ppm) in H-NMR at room temperature

(C) Six inner hydrogens are well shielded and shows an NMR signal at 3 {—2.88 ppm)
(D) There are two singlets in the NMR spectrum of [18]-Annulene at 100°C

The reaction in which nitrene is not an intermediate is :
(A) Curtius reaction (B) Arndt-Eistert reaction
(ಲ) Hoffman reaction (D) Schmidt reaction

The reaction used for the conversion of an aldose into the next higher ketose is :
(A) Wohl's Method (8) Ruff's Method
(9) Wolfram’s Method (D) Sowden-Fischer Synthesis

The intermediate associated with Wolff rearrangement reaction :
(ಹ) Nitrene (B) Ketene (0) Carbene (D) Carbanion

Which of the following vitamins and their deficiency diseases are not correctly
matched ?

(ಹಿ) Vitamin C - Scurvy (B) Vitamin B, - Pernicious Anemia
(ಲ) Vitamin B, - Pellagra (D) Vitamin B - Beri-beri

The reaction used for the synthesis of a-amino acids is :

(ಹಿ) Schmidt reaction (3) Hoffman's degradation reaction
(~) Strecker’s synthesis (D) Carius method

In the complexometric estimation of Ca?*, which of the following is a masking agent ?
(ಹ) Cyanide ion (B) Eriochrome Black T
© क्षत्र യ) അങ്ങ

The molar absorption coefficient of a complexis 1200 dm® mol - 1 ला) " and the minimum
detectable absorbance is 0.01. The minimum concentration of the complex that can be
detected using a sample cell of 1 cm is :

(५) 08x10-6M (B) 001M © ‏۶٤‎ (D) 833x10~6M

The numbser of significant figures in the following measurement is :
Temperature =0.0045°C
(ಹ) 4 ® 2 © 5 o 1

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