84. Which bond is formed firs between twe atems?
A. Sigma bond
C. Double bernd
B. Pi-bond
1). Triple bond
85. Which of the following has different melecular geomefry and electron pair geometry?
A. \( \mathrm{SO}_{3} \)
C. \( \mathrm{CO}_{2} \)
B. \( \mathrm{SnCl} \)
D. \( \mathrm{AF}_{3} \)
86. In which of the following compounds, the underlined element does not' have eight electrons in the outer shell
A. \( \mathrm{Li} O \)
C. PCfs
B. \( \mathrm{H}_{2} \mathrm{O}_{2} \)
D. PCIs
87. In which sequence are the molecules quoted in order of increasing bond angle with in the molecule.
A. \( \mathrm{H}_{2} \mathrm{O}, \mathrm{SF}_{6}, \mathrm{BF}_{3} \)
C. \( \mathrm{H}_{2} \mathrm{O}, \mathrm{CO}_{2}, \mathrm{BF}_{3} \)
B. \( \mathrm{H}_{2} \mathrm{O}, \mathrm{NH}_{3}, \mathrm{CH}_{4} \)
D. \( \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}_{2} \mathrm{BF}_{3} \)
88. Molecules having four bond pairs and no lone pair give geometry:
A. Trigonal
C. Octahedral
B. Tetrahedral
D. Triangular
89. The ratio of \( \pi \) and \( \sigma \) bonds in benzene is
A. \( 1: 2 \)
C. 1:6
B. \( 1: 4 \)
D. 3:6
90. Hybridization of 1 and 2 carbon atom in
\( { }^{1} \mathrm{CH}_{2}={ }^{2} \mathrm{C}=\mathrm{CH}_{2} \) are
A. sp, sp
B. \( \mathrm{sp}^{2}, \mathrm{sp}^{2} \)
C. \( \mathrm{sp}^{2}, \mathrm{sp} \)
D. \( \mathrm{sp}^{3}, \mathrm{sp}^{2} \)