Question 7 :
Which of the following reagents maybe used to distinguish between but-2-yne and but-1-yne.<br/>

Question 9 :
The hybrid orbital having equal amounts of s&#160;and p - characters is:

Question 12 :
Two hybrid orbitals having a bond angle of $120^0$C. The percentage of $s-$character in the hybrid orbital is nearly:

Question 13 :
Consider the following statements :<br/>(a) All hydrocarbons show phenomena of isomerism.<br/>(b) The members of a homologous series have similar chemical and physical properties.<br/>(c) Cyclic hydrocarbons are saturated or unsaturated organic compounds that contain ring of carbon atoms.<br/>(d) Synthetic detergents are sodium or potassium salts of long chain carboxylic acids.<br/>Which of the above statement(s) is/are correct?<br/>

Question 14 :
Assertion: Why organic compounds are studied separately as &#160;'Organic Chemistry'. Reason: There is a huge number of compounds of carbon due to its catenation and multiple bond formation property.

Question 15 :
What is the % s character in hybridization of carbon when it exerts strongest-I effect?

Question 21 :
The decreasing value of bond angles from $NH_3$ ($106^{\circ}$) to $SbH_3$ ($101^{\circ}$) down group-15 of the periodic table is due to:<br/>

Question 22 :
Few pairs of molecules are given below. Which bond of the molecule of the pairs is more polar?<br>(i) $H_3C - H, H_3C - Br$<br>(ii) $H_3C - NH_2, H_3C - OH$<br>(iii) $H_3C - OH, H_3C - SH$<br>(iv) $H_3C - Cl, H_3C - Br$

Question 25 :
The correct order of increasing s-character (in percentage) in the hybrid orbitals of the given&#160;molecules/ions is&#160;(assume all hybrid orbitals are exactly equivalent) :<br/>$:CH_{2} \ \ \ &#160;\ \ XeF_{4} \ \ &#160; \ \ \ BrF_{3} \ \ \ \ \ &#160; &#160;NCl_{3} \ \ \ &#160; :CCl_{2}$<br/>&#160; &#160; I &#160; &#160; &#160; &#160; &#160; &#160;II &#160; &#160; &#160; &#160; &#160; &#160; III &#160; &#160; &#160; &#160; &#160; IV &#160; &#160; &#160; &#160; &#160; &#160;V<br/>