The angle strain in cyclobutane is 9°44'

279.    The angle strain in cyclobutane is

(A) 24°44'

(B) 29°16'

(C) 19°22'

(D) 9°44'

Answer:: (D)

280.    The basic principle of Cottnell's precipitator is

(A) Le-chatelier's principle

(B) peptisation

(C) neutralisation of charge on colloidal particles

(D) scattering of light

Answer:: (C)

281.    The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

(A) SOCl2 in presence of pyridine

(B) Dry HCl in the presence of anhydrous ZnCl2

(C) PCl3

(D) PCl5

Answer:: (A)

282.    The calculated bond order of super oxide ion ( ) is

(A) 2.5

(B) 2

(C) 1.5

(D) 1

Answer:: (C)

283.    The carbon-carbon bond length in Benzene is

(A) in between C2H6 and C2H2

(B) in between C2H4 and C2H2

(C) in between C2H6 and C2H4

(D) same as in C2H4

Answer:: (C)

284.    The characteristic not related to alkali metal is

(A) low melting point

(B) low electronegativity

(C) high ionisation energy

(D) their ions are isoelectronic with noble gases

Answer:: (C)