Compound $X$ is the anhydride of sulphuric acid. The number of $\sigma$-bonds and the number of $\pi$-bonds present in $X$ are,respectively:
- A$3, 3$
- B$4, 2$
- C$2, 4$
- D$4, 3$
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Let $n_e$ be the number density of electrons and $v_d$ be the drift velocity in a semiconductor. When the temperature is increased:
Match the following columns:
Column-$I$ Column-$II$ $(A)$ Bryophytes $(i)$ Equisetum $(B)$ Gymnosperms $(ii)$ Onion $(C)$ Angiosperms $(iii)$ Anthoceros $(D)$ Pteridophytes $(iv)$ Thuja
| Column-$I$ | Column-$II$ |
|---|---|
| $(A)$ Bryophytes | $(i)$ Equisetum |
| $(B)$ Gymnosperms | $(ii)$ Onion |
| $(C)$ Angiosperms | $(iii)$ Anthoceros |
| $(D)$ Pteridophytes | $(iv)$ Thuja |
Which of the following is a hormone-releasing $IUD$?
The major product in the following reaction is:
$\cos ^{-1}\left(\frac{-1}{2}\right)-2 \sin ^{-1}\left(\frac{1}{2}\right)+3 \cos ^{-1}\left(\frac{-1}{\sqrt{2}}\right)-4 \tan ^{-1}(-1)$ equals:
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