Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from $$\mathrm{C}$$ to $$\mathrm{Pb}$$ in a regular manner. (B) Electronegativity decreases from $$\mathrm{C}$$ to $$\mathrm{Pb}$$ down the group gradually. (C) Maximum covalance of $$\mathrm{C}$$ is 4 whereas other elements can expand their covalance due to presence of d orbitals. (D) Heavier elements do not form $$\mathrm{p}\pi -\mathrm{p}\pi$$ bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :

Given below are two statements : Statement I : Gallium is used in the manufacturing of thermometers. Statement II : A thermometer containing gallium is useful for measuring the freezing point $$(256\mathrm{K})$$ of brine solution. In the light of the above statements, choose the correct answer from the options given below :

Which of the following material is not a semiconductor.

Match List - I with List - II. table { border-collapse: collapse; width: 100%; } th, td { border: 1px solid black; padding: 8px; text-align: left; } th { background-color: blue; color: white; } List I (Compound) List II (Use) (A) Carbon tetrachloride (I) Paint remover (B) Methylene chloride (II) Refrigerators and air conditioners (C) DDT (III) Fire extinguisher (D) Freons (IV) Non Biodegradable insecticide Choose the correct answer from the options given below :

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I (Compound) LIST II (Uses) A. Idoform I. Fire extinguisher B. Carbon tetrachloride II. Insecticide C. CFC III. Antiseptic D. DDT IV. Refrigerants Choose the correct answer from the options given below:

Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I Alkali Metal LIST II Emission Wavelength in nm A. Li I. 589.2 B. Na II. 455.5 C. Rb III. 670.8 D. Cs IV. 780.0 Choose the correct answer from the options given below :

The set of meta directing functional groups from the following sets is :

Lassaigne's test is used for detection of :

The functional group that shows negative resonance effect is :

Ionic reactions with organic compounds proceed through : (A) homolytic bond cleavage (B) heterolytic bond cleavage (C) free radical formation (D) primary free radical (E) secondary free radical Choose the correct answer from the options given below :

Which of the following compound will most easily be attacked by an electrophile?

Which of the following is strongest Bronsted base?

Which of the following has highly acidic hydrogen?

Cyclohexene is ________ type of an organic compound.

IUPAC name of following compound (P) is:

The order of relative stability of the contributing structure is : Choose the correct answer from the options given below :

The incorrect statement regarding conformations of ethane is :

Bond line formula of HOCH(CN)$${}_2$$ is :

Identify structure of 2,3-dibromo-1-phenylpentane.

The correct order of reactivity in electrophilic substitution reaction of the following compounds is :