The correct order of increasing thermal stability of and is -

One of the resonating structure of is

Which set of formal charge on oxygen and bond order is correct

Decreasing order of dipole moment of the following compound is-
A) 
B) 
C) 

Out of the two compounds shown below, the vapour pressure of (B) at a particular temperature is expected to be:
1) 
2) 

The number of σ&π bond in the compound respectively are -

Assertion : The electronic configuration nitrogen atom is represented as
 not as 
Reason: The configuration of ground state of an atom is the one which has the greatest multiplicity.

Ionisation energy of is atom^-1. The energy of the first stationary state (n=1) of is

Assertion : The set of all real numbers a such that a² + 2a, 2a + 3 and a² + 3a + 8 are the sides of a triangle is (5, ).
Reason : Since in a triangle sum of two sides is greater than the other and also sides are always positive.

Assertion : The distance of the orthocentre of ΔABC from its vertex A is 2R cos A
Reason : Orthocentre is the point of intersection of altitudes drawn from opposite vertex to the sides of triangle.

Assertion : The orthocentre of the given triangle is coincident with the in-centre of the pedal triangle of the given triangle.
Reason : Pedal triangle is the ex-central triangle of the given triangle.

The angles of a triangle ABC satisfy the relations 3B –C = 30º and A + 2B = 120º. If the perimeter of  the triangle is 2 (), then the largest side is C = 2 + 2.
Reason : Largest side in a triangle is the side opposite to the largest angle.

Assertion: In any triangle a cos A + b cos B + c cos 
Reason: In any trianglesinsinsin  

Assertion : If in a triangle sin²A + sin²B + sin²C = 2 then one of the angles must be 90º.
Reason : In any triangle sin²A + sin²B + sin² C = 2 + 2 cos A cos B cos C

Assertion : If in a triangle tan A : tan B : tan C = 1 : 2 : 3 then A = 45º
Reason : If p : q : r = 1 : 2 : 3 then p = 1

In any equilateral Δ, three circles of radii one are touching to the sides given as in the figure then area of the Δ

In this question, we have to find the area of the triangle, The formula of area of equilateral triangle is  x side2. Find the length of one side of the triangle in which  you have three circle is given with radius 1 unit.

Which of the following pieces of data does not uniquely determine an acute angled triangle ABC (R being the radius of the circumcircle) -

In this question, the which is not uniquely determine an acute angled triangle. If we know a, sin A , R, then we can get the ratio b/sin B or c/sin(A+B) only. We cannot determine the values of b, c, sin B, sin C separately.