####48. In the following reaction, [NEET Odisha 2019] $H_3 C-C \equiv CH \xrightarrow[873 K]{\substack{\text{ Red hot } \\ \text{ iron tube }}} A$, the number of sigma $(\sigma)$ bonds present in the product $A$, is
(a) 18
(b) 21
(c) 9
(d) 24
Number of $\sigma$
bonds $=21$
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