An octahedral complex is formed when hybrid orbitals of the following type are involved d2sp3

140.    An octahedral complex is formed when hybrid orbitals of the following type are involved

(A) sp3

(B) d sp2

(C) d2sp3

(D) sp2d2

Answer:: (C)

141.    An organic compound on heating with CuO produces CO2 but no water. The organic compound may be

(A) Methane

(B) Ethyl iodide

(C) Carbon tetrachloride

(D) Chloroform

Answer:: (C)

142.    An organic compound X is oxidised by using acidified K2Cr2O7. The product obtained reacts with Phenyl hydrazine but does not Answer: silver mirror test. The possible structure of X is

(A) (CH3)2CHOH

(B) CH3CHO

(C) CH3CH2OH

(D) CH3 ¾  ¾ CH3

Answer:: (A)

143.    An oxygen containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

(A) a primary alcohol

(B) an aldehyde

(C) a ketone

(D) a secondary alcohol

Answer:: (A)

144.    Anisole can be prepared by the action of methyl iodide on sodium phenate. The reaction is called

(A) Wurtz's reaction

(B) Williamson's reaction

(C) Fittig's reaction

(D) Etard's reaction

Answer:: (B)

145.    Argon is used

(A) in high temperature welding

(B) in radiotherapy for treatment of cancer

(C) in filling airships

(D) to obtain low temperature

Answer:: (A)

146.    Arrange the following in the increasing order of their basic strengths : CH3NH2, (CH3)2NH, (CH3)3N, NH3

(A) (CH3)3N < NH3 < CH3NH2 < (CH3)2 NH

(B) CH3NH2 < (CH3)2NH < (CH3)3N < NH3

(C) NH3 < (CH3)3N < (CH3)2NH < CH3NH2

(D) NH3 < (CH3)3N < CH3NH2 < (CH3)2NH

Answer:: (D)